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version 2.0

/*************************************************************************
 * (C) 2010 AITNET - Sofia/Bulgaria - <office@aitbg.com>
 *  by Michael Pounov <misho@aitbg.com>
 *
 * $Author: misho $
 * $Id: vap.c,v 1.4 2014/02/05 15:44:06 misho Exp $
 *
 *************************************************************************
The ELWIX and AITNET software is distributed under the following
terms:

All of the documentation and software included in the ELWIX and AITNET
Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>

Copyright 2004 - 2014
	by Michael Pounov <misho@elwix.org>.  All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
   must display the following acknowledgement:
This product includes software developed by Michael Pounov <misho@elwix.org>
ELWIX - Embedded LightWeight unIX and its contributors.
4. Neither the name of AITNET nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
#include "global.h"
#include "dwds.h"


static inline int
wifi_getParent(const char *csVAP, char *psParent, size_t plen)
{
	char szOID[STRSIZ] = { 0 };

	FTRACE(5);

	assert(csVAP);
	assert(psParent);

	memset(psParent, 0, plen);
	snprintf(szOID, STRSIZ, "net.wlan.%s.%%parent", csVAP + 4);
	if (sysctlbyname(szOID, psParent, &plen, NULL, 0) == -1) {
//		syslog(LOG_ERR, "Error:: can`t get parent #%d - %s\n", errno, strerror(errno));
		return -1;
	} else
		psParent[plen] = 0;

	return 0;
}

inline int
wifi_chkIface(const char *csVAP, char **ppsIF, int nIF)
{
	char szParent[IFNAMSIZ];
	register int i;

	FTRACE(5);

	assert(csVAP);

	if (wifi_getParent(csVAP, szParent, IFNAMSIZ) == -1)
		return 0;

	for (i = 0; i < nIF; i++)
		if (!strcasecmp(ppsIF[i], "any") || !strcmp(ppsIF[i], szParent))
			return 1; /* OK, vap is child */

	VERB(2) syslog(LOG_ERR, "Error:: Interface %s parent %s not being monitored", csVAP, szParent);
	return 0;
}

static inline int
wifi_isWDS(int fd, const char *csVAP)
{
	struct ifmediareq ifmr;

	FTRACE(5);

	assert(csVAP);

	memset(&ifmr, 0, sizeof ifmr);
	strlcpy(ifmr.ifm_name, csVAP, sizeof ifmr.ifm_name);
	if (ioctl(fd, SIOCGIFMEDIA, &ifmr) == -1) {
		syslog(LOG_ERR, "Error:: can`t get media for %s #%d - %s\n", csVAP, 
				errno, strerror(errno));
		return -1;
	}

	return (ifmr.ifm_current & IFM_IEEE80211_WDS) != 0;
}

static inline int
wifi_getBSSID(int fd, const char *csVAP, uint8_t *psBSSID, int len)
{
	struct ieee80211req ireq;

	FTRACE(5);

	assert(csVAP);
	assert(psBSSID);

	memset(&ireq, 0, sizeof ireq);
	strlcpy(ireq.i_name, csVAP, sizeof ireq.i_name);
	ireq.i_type = IEEE80211_IOC_BSSID;
	ireq.i_data = psBSSID;
	ireq.i_len = len;
	if (ioctl(fd, SIOCG80211, &ireq) == -1) {
		syslog(LOG_ERR, "Error:: can`t get BSSID for %s #%d - %s\n", csVAP, 
				errno, strerror(errno));
		return -1;
	}

	return 0;
}

struct dwds_if *
wifi_buildWDS(int fd, char **ppsIF, int nIF)
{
	struct dwds_if *p, *wds = NULL;
	char szVAP[IFNAMSIZ];
	struct ether_addr bssid;
	register int i;

	FTRACE(5);

	for (i = 0; i < 128; i++) {
		memset(szVAP, 0, IFNAMSIZ);
		snprintf(szVAP, IFNAMSIZ, "wlan%d", i);
		if (wifi_chkIface(szVAP, ppsIF, nIF) && !wifi_isWDS(fd, szVAP)) {
			p = malloc(sizeof(struct dwds_if));
			if (!p) {
				syslog(LOG_ERR, "Error:: can`t allocate memory #%d - %s\n", 
						errno, strerror(errno));
				i = -1;
				break;
			}
			strlcpy(p->if_name, szVAP, IFNAMSIZ);
			if (wifi_getBSSID(fd, szVAP, p->if_bssid, IEEE80211_ADDR_LEN) == -1) {
				syslog(LOG_ERR, "Error:: can`t get BSSID #%d - %s\n", 
						errno, strerror(errno));
				i = -1;
				break;
			}
			p->if_next = wds;
			wds = p;

			memcpy(&bssid, p->if_bssid, ETHER_ADDR_LEN);
			syslog(LOG_INFO, "BSSID:%s discover WDS vap %s\n", ether_ntoa(&bssid), szVAP);
		}
	}

	if (i == -1)
		while ((p = wds)) {
			wds = wds->if_next;
			free(p);
		}

	return wds;
}

inline int
wifi_destroyWDS(const char *csIface, struct dwds_if **wds)
{
	struct dwds_if *p, **pp;

	FTRACE(5);

	assert(csIface);
	assert(wds);

	for (pp = wds; (p = *pp); pp = &p->if_next)
		if (!strncmp(p->if_name, csIface, IFNAMSIZ))
			break;
	if (p) {
		*pp = p->if_next;
		free(p);
		return 0;
	}

	return 1;
}

static int
wifi_vapDestroy(const char *csVAP)
{
	struct ieee80211req ifr;
	int s;

	FTRACE(5);

	assert(csVAP);

	s = socket(PF_INET, SOCK_DGRAM, 0);
	if (s == -1) {
		syslog(LOG_ERR, "Error:: destroy socket(vap) %m\n");
		return -1;
	}

	memset(&ifr, 0, sizeof ifr);
	strlcpy(ifr.i_name, csVAP, IFNAMSIZ);
	if (ioctl(s, SIOCIFDESTROY, &ifr) == -1) {
		syslog(LOG_ERR, "Error:: destroy ioctl(vap) %m\n");
		close(s);
		return -1;
	} else
		close(s);

	return 0;
}

inline int
wifi_leaveWDS(struct ether_addr bssid, struct dwds_if **wds, char *psVAP, int vapLen)
{
	struct dwds_if *p, **pp;

	FTRACE(5);

	assert(wds);
	assert(psVAP);

	for (pp = wds; (p = *pp); pp = &p->if_next)
		if (!memcmp(p->if_bssid, &bssid, IEEE80211_ADDR_LEN))
			break;
	if (p) {
		*pp = p->if_next;
		strlcpy(psVAP, p->if_name, vapLen);
		if (wifi_vapDestroy(p->if_name) != -1)
		       VERB(1) syslog(LOG_INFO, "BSSID:%s WDS VAP %s destroyed\n", 
				       ether_ntoa(&bssid), p->if_name);	
		free(p);
		return 0;
	}

	return 1;
}

static int
wifi_vapCreate(const char *csIface, struct dwds_if *p)
{
	struct ieee80211_clone_params cp;
	struct ifreq ifr;
	struct ether_addr bssid;
	int s;

	FTRACE(5);

	assert(csIface);
	assert(p);

	s = socket(PF_INET, SOCK_DGRAM, 0);
	if (s == -1) {
		syslog(LOG_ERR, "Error:: create socket(vap) %m\n");
		return -1;
	}

	memset(&cp, 0, sizeof cp);
	strlcpy(cp.icp_parent, csIface, IFNAMSIZ);
	cp.icp_opmode = IEEE80211_M_WDS;
	memcpy(cp.icp_bssid, p->if_bssid, IEEE80211_ADDR_LEN);

	memset(&ifr, 0, sizeof ifr);
	strlcpy(ifr.ifr_name, "wlan", IFNAMSIZ);
	ifr.ifr_data = (void *) &cp;

	if (ioctl(s, SIOCIFCREATE2, &ifr) == -1) {
		memcpy(&bssid, cp.icp_bssid, IEEE80211_ADDR_LEN);
		syslog(LOG_ERR, "Error:: create ioctl(vap) mode %u flags 0x%x parent %s bssid %s %m\n", 
				cp.icp_opmode, cp.icp_flags, cp.icp_parent, ether_ntoa(&bssid));
		close(s);
		return -1;
	} else {
		strlcpy(p->if_name, ifr.ifr_name, IFNAMSIZ);
		close(s);
	}

	return 0;
}

inline int
wifi_createWDS(const char *csIface, struct ether_addr bssid, struct dwds_if **wds)
{
	struct dwds_if *p;
	char szParent[IFNAMSIZ];

	FTRACE(5);

	assert(csIface);
	assert(wds);

	for (p = *wds; p; p = p->if_next)
		if (!memcmp(p->if_bssid, &bssid, IEEE80211_ADDR_LEN)) {
			VERB(1) syslog(LOG_INFO, "BSSID:%s WDS VAP already created (%s)\n",
			    ether_ntoa(&bssid), csIface);
			return 1;
		}
	if (wifi_getParent(csIface, szParent, IFNAMSIZ) == -1) {
		syslog(LOG_ERR, "Error:: %s no pointer to parent interface\n", csIface);
		return -1;
	}

	p = malloc(sizeof(struct dwds_if));
	if (!p) {
		syslog(LOG_ERR, "Error:: malloc failed: %m\n");
		return -1;
	} else
		memcpy(p->if_bssid, &bssid, IEEE80211_ADDR_LEN);
	if (wifi_vapCreate(szParent, p) == -1) {
		free(p);
		return -1;
	} else {
		p->if_next = *wds;
		*wds = p;
		VERB(1) syslog(LOG_INFO, "BSSID:%s create WDS VAP %s\n", ether_ntoa(&bssid), p->if_name);
	}

	return 0;
}