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/* $NetBSD: tap.c,v 1.1 2008/08/17 13:20:57 plunky Exp $ */
/*-
* Copyright (c) 2008 Iain Hibbert
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/* $FreeBSD$ */
#include <sys/cdefs.h>
__RCSID("$NetBSD: tap.c,v 1.1 2008/08/17 13:20:57 plunky Exp $");
#include <sys/types.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <net/if_tap.h>
#include <fcntl.h>
#include <libutil.h>
#include <paths.h>
#include <stdio.h>
#include <unistd.h>
#include "btpand.h"
static bool tap_send(channel_t *, packet_t *);
static bool tap_recv(packet_t *);
void
tap_init(void)
{
channel_t *chan;
struct ifreq ifr;
int fd, s;
char pidfile[PATH_MAX];
fd = open(interface_name, O_RDWR);
if (fd == -1) {
log_err("Could not open \"%s\": %m", interface_name);
exit(EXIT_FAILURE);
}
memset(&ifr, 0, sizeof(ifr));
if (ioctl(fd, TAPGIFNAME, &ifr) == -1) {
log_err("Could not get interface name: %m");
exit(EXIT_FAILURE);
}
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s == -1) {
log_err("Could not open PF_LINK socket: %m");
exit(EXIT_FAILURE);
}
ifr.ifr_addr.sa_family = AF_LINK;
ifr.ifr_addr.sa_len = ETHER_ADDR_LEN;
b2eaddr(ifr.ifr_addr.sa_data, &local_bdaddr);
if (ioctl(s, SIOCSIFLLADDR, &ifr) == -1) {
log_err("Could not set %s physical address: %m", ifr.ifr_name);
exit(EXIT_FAILURE);
}
if (ioctl(s, SIOCGIFFLAGS, &ifr) == -1) {
log_err("Could not get interface flags: %m");
exit(EXIT_FAILURE);
}
if ((ifr.ifr_flags & IFF_UP) == 0) {
ifr.ifr_flags |= IFF_UP;
if (ioctl(s, SIOCSIFFLAGS, &ifr) == -1) {
log_err("Could not set IFF_UP: %m");
exit(EXIT_FAILURE);
}
}
close(s);
log_info("Using interface %s with addr %s", ifr.ifr_name,
ether_ntoa((struct ether_addr *)&ifr.ifr_addr.sa_data));
chan = channel_alloc();
if (chan == NULL)
exit(EXIT_FAILURE);
chan->send = tap_send;
chan->recv = tap_recv;
chan->mru = ETHER_HDR_LEN + ETHER_MAX_LEN;
memcpy(chan->raddr, ifr.ifr_addr.sa_data, ETHER_ADDR_LEN);
memcpy(chan->laddr, ifr.ifr_addr.sa_data, ETHER_ADDR_LEN);
chan->state = CHANNEL_OPEN;
if (!channel_open(chan, fd))
exit(EXIT_FAILURE);
snprintf(pidfile, sizeof(pidfile), "%s/%s.pid",
_PATH_VARRUN, ifr.ifr_name);
chan->pfh = pidfile_open(pidfile, 0600, NULL);
if (chan->pfh == NULL)
log_err("can't create pidfile");
else if (pidfile_write(chan->pfh) < 0) {
log_err("can't write pidfile");
pidfile_remove(chan->pfh);
chan->pfh = NULL;
}
}
static bool
tap_send(channel_t *chan, packet_t *pkt)
{
struct iovec iov[4];
ssize_t nw;
iov[0].iov_base = pkt->dst;
iov[0].iov_len = ETHER_ADDR_LEN;
iov[1].iov_base = pkt->src;
iov[1].iov_len = ETHER_ADDR_LEN;
iov[2].iov_base = pkt->type;
iov[2].iov_len = ETHER_TYPE_LEN;
iov[3].iov_base = pkt->ptr;
iov[3].iov_len = pkt->len;
/* tap device write never fails */
nw = writev(chan->fd, iov, __arraycount(iov));
assert(nw > 0);
return true;
}
static bool
tap_recv(packet_t *pkt)
{
if (pkt->len < ETHER_HDR_LEN)
return false;
pkt->dst = pkt->ptr;
packet_adj(pkt, ETHER_ADDR_LEN);
pkt->src = pkt->ptr;
packet_adj(pkt, ETHER_ADDR_LEN);
pkt->type = pkt->ptr;
packet_adj(pkt, ETHER_TYPE_LEN);
return true;
}
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