/************************************************************************* * (C) 2010 AITNET - Sofia/Bulgaria - * by Michael Pounov * * $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 Copyright 2004 - 2014 by Michael Pounov . 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 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; }