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/* $OpenBSD: apme.c,v 1.5 2005/10/07 22:32:52 reyk Exp $ */
/*
* Copyright (c) 2004, 2005 Reyk Floeter <reyk@vantronix.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_arp.h>
#include <net/if_llc.h>
#include <net/bpf.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <arpa/inet.h>
#include <net80211/ieee80211_radiotap.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "hostapd.h"
#include "iapp.h"
void hostapd_apme_frame(struct hostapd_config *, u_int8_t *, u_int);
void
hostapd_apme_input(int fd, short sig, void *arg)
{
struct hostapd_config *cfg = (struct hostapd_config *)arg;
u_int8_t buf[IAPP_MAXSIZE], *bp, *ep;
struct bpf_hdr *bph;
ssize_t len;
/* Ignore invalid signals */
if (sig != EV_READ)
return;
bzero(&buf, sizeof(buf));
if ((len = read(fd, buf, sizeof(buf))) <
(ssize_t)sizeof(struct ieee80211_frame))
return;
/*
* Loop through each frame.
*/
bp = (u_int8_t *)&buf;
bph = (struct bpf_hdr *)bp;
ep = bp + len;
while (bp < ep) {
register int caplen, hdrlen;
caplen = bph->bh_caplen;
hdrlen = bph->bh_hdrlen;
/* Process frame */
hostapd_apme_frame(cfg, bp + hdrlen, caplen);
bp += BPF_WORDALIGN(caplen + hdrlen);
}
}
int
hostapd_apme_output(struct hostapd_config *cfg,
struct hostapd_ieee80211_frame *frame)
{
struct iovec iov[2];
int iovcnt;
struct ieee80211_frame wh;
bzero(&wh, sizeof(wh));
switch (frame->i_fc[1] & IEEE80211_FC1_DIR_MASK) {
case IEEE80211_FC1_DIR_NODS:
bcopy(frame->i_from, wh.i_addr2, IEEE80211_ADDR_LEN);
bcopy(frame->i_to, wh.i_addr1, IEEE80211_ADDR_LEN);
bcopy(frame->i_bssid, wh.i_addr3, IEEE80211_ADDR_LEN);
break;
case IEEE80211_FC1_DIR_TODS:
bcopy(frame->i_from, wh.i_addr2, IEEE80211_ADDR_LEN);
bcopy(frame->i_to, wh.i_addr3, IEEE80211_ADDR_LEN);
bcopy(frame->i_bssid, wh.i_addr1, IEEE80211_ADDR_LEN);
break;
case IEEE80211_FC1_DIR_FROMDS:
bcopy(frame->i_from, wh.i_addr3, IEEE80211_ADDR_LEN);
bcopy(frame->i_to, wh.i_addr1, IEEE80211_ADDR_LEN);
bcopy(frame->i_bssid, wh.i_addr2, IEEE80211_ADDR_LEN);
break;
default:
case IEEE80211_FC1_DIR_DSTODS:
return (EINVAL);
}
wh.i_fc[0] = IEEE80211_FC0_VERSION_0 | frame->i_fc[0];
wh.i_fc[1] = frame->i_fc[1];
bcopy(frame->i_dur, wh.i_dur, sizeof(wh.i_dur));
bcopy(frame->i_seq, wh.i_seq, sizeof(wh.i_seq));
iovcnt = 1;
iov[0].iov_base = &wh;
iov[0].iov_len = sizeof(struct ieee80211_frame);
if (frame->i_data != NULL && frame->i_data_len > 0) {
iovcnt = 2;
iov[1].iov_base = frame->i_data;
iov[1].iov_len = frame->i_data_len;
}
if (writev(cfg->c_apme_raw, iov, iovcnt) == -1)
return (errno);
return (0);
}
int
hostapd_apme_offset(struct hostapd_config *cfg,
u_int8_t *buf, const u_int len)
{
struct ieee80211_radiotap_header *rh;
u_int rh_len;
if (cfg->c_apme_dlt == DLT_IEEE802_11)
return (0);
else if (cfg->c_apme_dlt != DLT_IEEE802_11_RADIO)
return (-1);
if (len < sizeof(struct ieee80211_radiotap_header))
return (-1);
rh = (struct ieee80211_radiotap_header*)buf;
rh_len = letoh16(rh->it_len);
if (rh->it_version != 0)
return (-1);
if (len <= rh_len)
return (-1);
return ((int)rh_len);
}
void
hostapd_apme_frame(struct hostapd_config *cfg, u_int8_t *buf, u_int len)
{
struct hostapd_node node;
struct ieee80211_frame *wh;
int offset;
if ((offset = hostapd_apme_offset(cfg, buf, len)) < 0)
return;
wh = (struct ieee80211_frame *)(buf + offset);
/* Ignore short frames or fragments */
if (len < sizeof(struct ieee80211_frame))
return;
/* Handle received frames */
if ((hostapd_handle_input(cfg, buf, len) ==
(HOSTAPD_FRAME_F_RET_SKIP >> HOSTAPD_FRAME_F_RET_S)) ||
cfg->c_flags & HOSTAPD_CFG_F_IAPP_PASSIVE)
return;
/*
* Only accept local association response frames, ...
*/
if (!((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) ==
IEEE80211_FC1_DIR_NODS &&
(wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) ==
IEEE80211_FC0_TYPE_MGT &&
(wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) ==
IEEE80211_FC0_SUBTYPE_ASSOC_RESP))
return;
/*
* ...sent by the Host AP (addr2) to our BSSID (addr3)
*/
if (bcmp(wh->i_addr2, cfg->c_apme_bssid, IEEE80211_ADDR_LEN) != 0 ||
bcmp(wh->i_addr3, cfg->c_apme_bssid, IEEE80211_ADDR_LEN) != 0)
return;
cfg->c_stats.cn_rx_apme++;
/*
* Double-check if the station got associated to our Host AP
*/
bcopy(wh->i_addr1, node.ni_macaddr, IEEE80211_ADDR_LEN);
if (hostapd_priv_apme_getnode(cfg, &node) != 0) {
hostapd_log(HOSTAPD_LOG_DEBUG,
"%s: invalid association from %s on the Host AP\n",
cfg->c_apme_iface, etheraddr_string(wh->i_addr1));
return;
}
cfg->c_stats.cn_tx_apme++;
hostapd_iapp_add_notify(cfg, &node);
}
void
hostapd_apme_init(struct hostapd_config *cfg)
{
u_int i, dlt;
struct ifreq ifr;
cfg->c_apme_raw = hostapd_bpf_open(O_RDWR);
cfg->c_apme_rawlen = IAPP_MAXSIZE;
if (ioctl(cfg->c_apme_raw, BIOCSBLEN, &cfg->c_apme_rawlen) == -1)
hostapd_fatal("failed to set BPF buffer len \"%s\": %s\n",
cfg->c_apme_iface, strerror(errno));
i = 1;
if (ioctl(cfg->c_apme_raw, BIOCIMMEDIATE, &i) == -1)
hostapd_fatal("failed to set BPF immediate mode on \"%s\": "
"%s\n", cfg->c_apme_iface, strerror(errno));
bzero(&ifr, sizeof(struct ifreq));
strlcpy(ifr.ifr_name, cfg->c_apme_iface, sizeof(ifr.ifr_name));
/* This may fail, ignore it */
ioctl(cfg->c_apme_raw, BIOCPROMISC, NULL);
/* Associate the wireless network interface to the BPF descriptor */
if (ioctl(cfg->c_apme_raw, BIOCSETIF, &ifr) == -1)
hostapd_fatal("failed to set BPF interface \"%s\": %s\n",
cfg->c_apme_iface, strerror(errno));
dlt = cfg->c_apme_dlt;
if (ioctl(cfg->c_apme_raw, BIOCSDLT, &dlt) == -1)
hostapd_fatal("failed to set BPF link type on \"%s\": %s\n",
cfg->c_apme_iface, strerror(errno));
/* Lock the BPF descriptor, no further configuration */
if (ioctl(cfg->c_apme_raw, BIOCLOCK, NULL) == -1)
hostapd_fatal("failed to lock BPF interface on \"%s\": %s\n",
cfg->c_apme_iface, strerror(errno));
}
int
hostapd_apme_addnode(struct hostapd_config *cfg, struct hostapd_node *node)
{
return (hostapd_priv_apme_setnode(cfg, node, 1));
}
int
hostapd_apme_delnode(struct hostapd_config *cfg, struct hostapd_node *node)
{
return (hostapd_priv_apme_setnode(cfg, node, 0));
}
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