diff options
Diffstat (limited to 'usr.sbin/bluetooth/btpand/tap.c')
| -rw-r--r-- | usr.sbin/bluetooth/btpand/tap.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/usr.sbin/bluetooth/btpand/tap.c b/usr.sbin/bluetooth/btpand/tap.c new file mode 100644 index 000000000000..011ae3989154 --- /dev/null +++ b/usr.sbin/bluetooth/btpand/tap.c @@ -0,0 +1,169 @@ +/* $NetBSD: tap.c,v 1.1 2008/08/17 13:20:57 plunky Exp $ */ + +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * 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. + */ + + +#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> + +#define L2CAP_SOCKET_CHECKED +#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; +} |