7718ced0ea
Bluetooth Network Access Point (NAP), Group Ad-hoc Network (GN) and Personal Area Network User (PANU) profiles. Obtained from: NetBSD MFC after: 1 month
168 lines
4.3 KiB
C
168 lines
4.3 KiB
C
/* $NetBSD: tap.c,v 1.1 2008/08/17 13:20:57 plunky Exp $ */
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/*-
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* Copyright (c) 2008 Iain Hibbert
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* $FreeBSD$ */
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: tap.c,v 1.1 2008/08/17 13:20:57 plunky Exp $");
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/uio.h>
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#include <net/if_tap.h>
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#include <fcntl.h>
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#include <libutil.h>
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#include <paths.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "btpand.h"
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static bool tap_send(channel_t *, packet_t *);
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static bool tap_recv(packet_t *);
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void
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tap_init(void)
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{
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channel_t *chan;
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struct ifreq ifr;
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int fd, s;
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char pidfile[PATH_MAX];
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fd = open(interface_name, O_RDWR);
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if (fd == -1) {
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log_err("Could not open \"%s\": %m", interface_name);
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exit(EXIT_FAILURE);
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}
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memset(&ifr, 0, sizeof(ifr));
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if (ioctl(fd, TAPGIFNAME, &ifr) == -1) {
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log_err("Could not get interface name: %m");
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exit(EXIT_FAILURE);
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}
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s = socket(AF_INET, SOCK_DGRAM, 0);
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if (s == -1) {
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log_err("Could not open PF_LINK socket: %m");
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exit(EXIT_FAILURE);
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}
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ifr.ifr_addr.sa_family = AF_LINK;
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ifr.ifr_addr.sa_len = ETHER_ADDR_LEN;
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b2eaddr(ifr.ifr_addr.sa_data, &local_bdaddr);
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if (ioctl(s, SIOCSIFLLADDR, &ifr) == -1) {
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log_err("Could not set %s physical address: %m", ifr.ifr_name);
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exit(EXIT_FAILURE);
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}
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if (ioctl(s, SIOCGIFFLAGS, &ifr) == -1) {
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log_err("Could not get interface flags: %m");
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exit(EXIT_FAILURE);
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}
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if ((ifr.ifr_flags & IFF_UP) == 0) {
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ifr.ifr_flags |= IFF_UP;
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if (ioctl(s, SIOCSIFFLAGS, &ifr) == -1) {
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log_err("Could not set IFF_UP: %m");
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exit(EXIT_FAILURE);
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}
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}
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close(s);
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log_info("Using interface %s with addr %s", ifr.ifr_name,
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ether_ntoa((struct ether_addr *)&ifr.ifr_addr.sa_data));
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chan = channel_alloc();
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if (chan == NULL)
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exit(EXIT_FAILURE);
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chan->send = tap_send;
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chan->recv = tap_recv;
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chan->mru = ETHER_HDR_LEN + ETHER_MAX_LEN;
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memcpy(chan->raddr, ifr.ifr_addr.sa_data, ETHER_ADDR_LEN);
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memcpy(chan->laddr, ifr.ifr_addr.sa_data, ETHER_ADDR_LEN);
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chan->state = CHANNEL_OPEN;
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if (!channel_open(chan, fd))
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exit(EXIT_FAILURE);
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snprintf(pidfile, sizeof(pidfile), "%s/%s.pid",
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_PATH_VARRUN, ifr.ifr_name);
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chan->pfh = pidfile_open(pidfile, 0600, NULL);
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if (chan->pfh == NULL)
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log_err("can't create pidfile");
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else if (pidfile_write(chan->pfh) < 0) {
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log_err("can't write pidfile");
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pidfile_remove(chan->pfh);
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chan->pfh = NULL;
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}
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}
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static bool
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tap_send(channel_t *chan, packet_t *pkt)
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{
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struct iovec iov[4];
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ssize_t nw;
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iov[0].iov_base = pkt->dst;
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iov[0].iov_len = ETHER_ADDR_LEN;
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iov[1].iov_base = pkt->src;
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iov[1].iov_len = ETHER_ADDR_LEN;
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iov[2].iov_base = pkt->type;
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iov[2].iov_len = ETHER_TYPE_LEN;
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iov[3].iov_base = pkt->ptr;
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iov[3].iov_len = pkt->len;
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/* tap device write never fails */
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nw = writev(chan->fd, iov, __arraycount(iov));
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assert(nw > 0);
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return true;
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}
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static bool
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tap_recv(packet_t *pkt)
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{
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if (pkt->len < ETHER_HDR_LEN)
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return false;
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pkt->dst = pkt->ptr;
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packet_adj(pkt, ETHER_ADDR_LEN);
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pkt->src = pkt->ptr;
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packet_adj(pkt, ETHER_ADDR_LEN);
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pkt->type = pkt->ptr;
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packet_adj(pkt, ETHER_TYPE_LEN);
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return true;
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}
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