[thirdparty/dhcp.git] / common / upf.c

/* upf.c

   Ultrix PacketFilter interface code. */

/*
 * Copyright (c) 1996-2000 Internet Software Consortium.
 * 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. Neither the name of The Internet Software Consortium 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 THE INTERNET SOFTWARE CONSORTIUM 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 INTERNET SOFTWARE CONSORTIUM 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.
 *
 * This software has been written for the Internet Software Consortium
 * by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
 * To learn more about the Internet Software Consortium, see
 * ``http://www.isc.org/''.  To learn more about Vixie Enterprises,
 * see ``http://www.vix.com''.   To learn more about Nominum, Inc., see
 * ``http://www.nominum.com''.
 */

#ifndef lint
static char copyright[] =
"$Id: upf.c,v 1.17 2000/03/17 03:59:02 mellon Exp $ Copyright (c) 1996-2000 The Internet Software Consortium.  All rights reserved.\n";
#endif /* not lint */

#include "dhcpd.h"
#if defined (USE_UPF_SEND) || defined (USE_UPF_RECEIVE)
#include <sys/ioctl.h>
#include <sys/uio.h>

#include <net/pfilt.h>
#include <netinet/in_systm.h>
#include "includes/netinet/ip.h"
#include "includes/netinet/udp.h"
#include "includes/netinet/if_ether.h"

/* Reinitializes the specified interface after an address change.   This
   is not required for packet-filter APIs. */

#ifdef USE_UPF_SEND
void if_reinitialize_send (info)
	struct interface_info *info;
{
}
#endif

#ifdef USE_UPF_RECEIVE
void if_reinitialize_receive (info)
	struct interface_info *info;
{
}
#endif

/* Called by get_interface_list for each interface that's discovered.
   Opens a packet filter for each interface and adds it to the select
   mask. */

int if_register_upf (info)
	struct interface_info *info;
{
	int sock;
	char filename[50];
	int b;
	struct endevp param;

	/* Open a UPF device */
	for (b = 0; 1; b++) {
#ifndef NO_SNPRINTF
		snprintf(filename, sizeof(filename), "/dev/pf/pfilt%d", b);
#else
		sprintf(filename, "/dev/pf/pfilt%d", b);
#endif
		sock = open (filename, O_RDWR, 0);
		if (sock < 0) {
			if (errno == EBUSY) {
				continue;
			} else {
				log_fatal ("Can't find free upf: %m");
			}
		} else {
			break;
		}
	}

	/* Set the UPF device to point at this interface. */
	if (ioctl (sock, EIOCSETIF, info -> ifp) < 0)
		log_fatal ("Can't attach interface %s to upf device %s: %m",
		       info -> name, filename);

	/* Get the hardware address. */
	if (ioctl (sock, EIOCDEVP, &param) < 0)
		log_fatal ("Can't get interface %s hardware address: %m",
		       info -> name);

	/* We only know how to do ethernet. */
	if (param.end_dev_type != ENDT_10MB)	
		log_fatal ("Invalid device type on network interface %s: %d",
		       info -> name, param.end_dev_type);

	if (param.end_addr_len != 6)
		log_fatal ("Invalid hardware address length on %s: %d",
		       info -> name, param.end_addr_len);

	info -> hw_address.hlen = 7;
	info -> hw_address.hbuf [0] = ARPHRD_ETHER;
	memcpy (&info -> hw_address.hbuf [1], param.end_addr, 6);

	return sock;
}
#endif /* USE_UPF_SEND || USE_UPF_RECEIVE */

#ifdef USE_UPF_SEND
void if_register_send (info)
	struct interface_info *info;
{
	/* If we're using the upf API for sending and receiving,
	   we don't need to register this interface twice. */
#ifndef USE_UPF_RECEIVE
	info -> wfdesc = if_register_upf (info, interface);
#else
	info -> wfdesc = info -> rfdesc;
#endif
        if (!quiet_interface_discovery)
		log_info ("Sending on   UPF/%s/%s%s%s",
		      info -> name,
		      print_hw_addr (info -> hw_address.hbuf [0],
				     info -> hw_address.hlen - 1,
				     &info -> hw_address.hbuf [1]),
		      (info -> shared_network ? "/" : ""),
		      (info -> shared_network ?
		       info -> shared_network -> name : ""));
}

void if_deregister_send (info)
	struct interface_info *info;
{
#ifndef USE_UPF_RECEIVE
	close (info -> wfdesc);
#endif
	info -> wfdesc = -1;
        if (!quiet_interface_discovery)
		log_info ("Disabling output on UPF/%s/%s%s%s",
		      info -> name,
		      print_hw_addr (info -> hw_address.hbuf [0],
				     info -> hw_address.hlen - 1,
				     &info -> hw_address.hbuf [1]),
		      (info -> shared_network ? "/" : ""),
		      (info -> shared_network ?
		       info -> shared_network -> name : ""));
}
#endif /* USE_UPF_SEND */

#ifdef USE_UPF_RECEIVE
/* Packet filter program...
   XXX Changes to the filter program may require changes to the constant
   offsets used in if_register_send to patch the UPF program! XXX */


void if_register_receive (info)
	struct interface_info *info;
{
	int flag = 1;
	u_int32_t addr;
	struct enfilter pf;
	u_int32_t bits;

	/* Open a UPF device and hang it on this interface... */
	info -> rfdesc = if_register_upf (info);

	/* Allow the copyall flag to be set... */
	if (ioctl(info -> rfdesc, EIOCALLOWCOPYALL, &flag) < 0)
		log_fatal ("Can't set ALLOWCOPYALL: %m");

	/* Clear all the packet filter mode bits first... */
	flag = (ENHOLDSIG | ENBATCH | ENTSTAMP | ENPROMISC |
		ENNONEXCL | ENCOPYALL);
	if (ioctl (info -> rfdesc, EIOCMBIC, &flag) < 0)
		log_fatal ("Can't clear pfilt bits: %m");

	/* Set the ENBATCH and ENCOPYALL bits... */
	bits = ENBATCH | ENCOPYALL;
	if (ioctl (info -> rfdesc, EIOCMBIS, &bits) < 0)
		log_fatal ("Can't set ENBATCH|ENCOPYALL: %m");

	/* Set up the UPF filter program. */
	/* XXX Unlike the BPF filter program, this one won't work if the
	   XXX IP packet is fragmented or if there are options on the IP
	   XXX header. */
	pf.enf_Priority = 0;
	pf.enf_FilterLen = 0;

	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHWORD + 6;
	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHLIT + ENF_CAND;
	pf.enf_Filter [pf.enf_FilterLen++] = htons (ETHERTYPE_IP);
	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHLIT;
	pf.enf_Filter [pf.enf_FilterLen++] = htons (IPPROTO_UDP);
	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHWORD + 11;
	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHLIT + ENF_AND;
	pf.enf_Filter [pf.enf_FilterLen++] = htons (0xFF);
	pf.enf_Filter [pf.enf_FilterLen++] = ENF_CAND;
	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHWORD + 18;
	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHLIT + ENF_CAND;
	pf.enf_Filter [pf.enf_FilterLen++] = local_port;

	if (ioctl (info -> rfdesc, EIOCSETF, &pf) < 0)
		log_fatal ("Can't install packet filter program: %m");
        if (!quiet_interface_discovery)
		log_info ("Listening on UPF/%s/%s%s%s",
		      info -> name,
		      print_hw_addr (info -> hw_address.hbuf [0],
				     info -> hw_address.hlen - 1,
				     &info -> hw_address.hbuf [1]),
		      (info -> shared_network ? "/" : ""),
		      (info -> shared_network ?
		       info -> shared_network -> name : ""));
}

void if_deregister_receive (info)
	struct interface_info *info;
{
	close (info -> rfdesc);
	info -> rfdesc = -1;
        if (!quiet_interface_discovery)
		log_info ("Disabling input on UPF/%s/%s%s%s",
		      info -> name,
		      print_hw_addr (info -> hw_address.hbuf [0],
				     info -> hw_address.hlen - 1,
				     &info -> hw_address.hbuf [1]),
		      (info -> shared_network ? "/" : ""),
		      (info -> shared_network ?
		       info -> shared_network -> name : ""));
}
#endif /* USE_UPF_RECEIVE */

#ifdef USE_UPF_SEND
ssize_t send_packet (interface, packet, raw, len, from, to, hto)
	struct interface_info *interface;
	struct packet *packet;
	struct dhcp_packet *raw;
	size_t len;
	struct in_addr from;
	struct sockaddr_in *to;
	struct hardware *hto;
{
	unsigned bufp = 0;
	unsigned char buf [256];
	struct iovec iov [2];
	int result;

	if (!strcmp (interface -> name, "fallback"))
		return send_fallback (interface, packet, raw,
				      len, from, to, hto);

	/* Assemble the headers... */
	assemble_hw_header (interface, buf, &bufp, hto);
	assemble_udp_ip_header (interface, buf, &bufp, from.s_addr,
				to -> sin_addr.s_addr, to -> sin_port,
				(unsigned char *)raw, len);

	/* Fire it off */
	iov [0].iov_base = (char *)buf;
	iov [0].iov_len = bufp;
	iov [1].iov_base = (char *)raw;
	iov [1].iov_len = len;

	result = writev(interface -> wfdesc, iov, 2);
	if (result < 0)
		log_error ("send_packet: %m");
	return result;
}
#endif /* USE_UPF_SEND */

#ifdef USE_UPF_RECEIVE
ssize_t receive_packet (interface, buf, len, from, hfrom)
	struct interface_info *interface;
	unsigned char *buf;
	size_t len;
	struct sockaddr_in *from;
	struct hardware *hfrom;
{
	int nread;
	int length = 0;
	int offset = 0;
	unsigned char ibuf [1500 + sizeof (struct enstamp)];
	int bufix = 0;

	length = read (interface -> rfdesc, ibuf, sizeof ibuf);
	if (length <= 0)
		return length;

	bufix = sizeof (struct enstamp);
	/* Decode the physical header... */
	offset = decode_hw_header (interface, ibuf, bufix, hfrom);

	/* If a physical layer checksum failed (dunno of any
	   physical layer that supports this, but WTH), skip this
	   packet. */
	if (offset < 0) {
		return 0;
	}

	bufix += offset;
	length -= offset;

	/* Decode the IP and UDP headers... */
	offset = decode_udp_ip_header (interface, ibuf, bufix,
				       from, (unsigned char *)0, length);

	/* If the IP or UDP checksum was bad, skip the packet... */
	if (offset < 0)
		return 0;

	bufix += offset;
	length -= offset;

	/* Copy out the data in the packet... */
	memcpy (buf, &ibuf [bufix], length);
	return length;
}

int can_unicast_without_arp (ip)
	struct interface_info *ip;
{
	return 1;
}

int can_receive_unicast_unconfigured (ip)
	struct interface_info *ip;
{
	return 1;
}

void maybe_setup_fallback ()
{
	isc_result_t status;
	struct interface_info *fbi;
	fbi = setup_fallback ();
	if (fbi) {
		if_register_fallback (fbi);
		fbi -> refcnt = 1;
		fbi -> type = dhcp_type_interface;
		status = omapi_register_io_object ((omapi_object_t *)fbi,
						   if_readsocket, 0,
						   fallback_discard, 0, 0);
		if (status != ISC_R_SUCCESS)
			log_fatal ("Can't register I/O handle for %s: %s",
				   fbi -> name, isc_result_totext (status));
	}
}
#endif
Commit	Line	Data
179f54ab TL	1	/* upf.c
179f54ab TL	2
2d1b06e0	3	Ultrix PacketFilter interface code. */
179f54ab TL	4
179f54ab TL	5	/*
49733f31 TL	6	* Copyright (c) 1996-2000 Internet Software Consortium.
49733f31 TL	7	* All rights reserved.
179f54ab	8	*
49733f31 TL	9	* Redistribution and use in source and binary forms, with or without
	10	* modification, are permitted provided that the following conditions
	11	* are met:
179f54ab	12	*
49733f31 TL	13	* 1. Redistributions of source code must retain the above copyright
	14	* notice, this list of conditions and the following disclaimer.
	15	* 2. Redistributions in binary form must reproduce the above copyright
	16	* notice, this list of conditions and the following disclaimer in the
	17	* documentation and/or other materials provided with the distribution.
	18	* 3. Neither the name of The Internet Software Consortium nor the names
	19	* of its contributors may be used to endorse or promote products derived
	20	* from this software without specific prior written permission.
179f54ab	21	*
49733f31 TL	22	* THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
	23	* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
	24	* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	25	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	26	* DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
	27	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	28	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	29	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
	30	* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	31	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	32	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
	33	* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	34	* SUCH DAMAGE.
	35	*
	36	* This software has been written for the Internet Software Consortium
	37	* by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
	38	* To learn more about the Internet Software Consortium, see
	39	* ``http://www.isc.org/''. To learn more about Vixie Enterprises,
	40	* see ``http://www.vix.com''. To learn more about Nominum, Inc., see
	41	* ``http://www.nominum.com''.
179f54ab TL	42	*/
	43
	44	#ifndef lint
	45	static char copyright[] =
49733f31	46	"$Id: upf.c,v 1.17 2000/03/17 03:59:02 mellon Exp $ Copyright (c) 1996-2000 The Internet Software Consortium. All rights reserved.\n";
179f54ab TL	47	#endif /* not lint */
	48
	49	#include "dhcpd.h"
	50	#if defined (USE_UPF_SEND) \|\| defined (USE_UPF_RECEIVE)
	51	#include <sys/ioctl.h>
	52	#include <sys/uio.h>
	53
	54	#include <net/pfilt.h>
	55	#include <netinet/in_systm.h>
	56	#include "includes/netinet/ip.h"
	57	#include "includes/netinet/udp.h"
	58	#include "includes/netinet/if_ether.h"
	59
	60	/* Reinitializes the specified interface after an address change. This
	61	is not required for packet-filter APIs. */
	62
	63	#ifdef USE_UPF_SEND
	64	void if_reinitialize_send (info)
	65	struct interface_info *info;
	66	{
	67	}
	68	#endif
	69
	70	#ifdef USE_UPF_RECEIVE
	71	void if_reinitialize_receive (info)
	72	struct interface_info *info;
	73	{
	74	}
	75	#endif
	76
	77	/* Called by get_interface_list for each interface that's discovered.
	78	Opens a packet filter for each interface and adds it to the select
	79	mask. */
	80
	81	int if_register_upf (info)
	82	struct interface_info *info;
	83	{
	84	int sock;
	85	char filename[50];
	86	int b;
	87	struct endevp param;
	88
	89	/* Open a UPF device */
	90	for (b = 0; 1; b++) {
	91	#ifndef NO_SNPRINTF
	92	snprintf(filename, sizeof(filename), "/dev/pf/pfilt%d", b);
	93	#else
	94	sprintf(filename, "/dev/pf/pfilt%d", b);
	95	#endif
	96	sock = open (filename, O_RDWR, 0);
	97	if (sock < 0) {
	98	if (errno == EBUSY) {
	99	continue;
	100	} else {
8ae2d595	101	log_fatal ("Can't find free upf: %m");
179f54ab TL	102	}
	103	} else {
	104	break;
	105	}
	106	}
	107
	108	/* Set the UPF device to point at this interface. */
	109	if (ioctl (sock, EIOCSETIF, info -> ifp) < 0)
8ae2d595	110	log_fatal ("Can't attach interface %s to upf device %s: %m",
179f54ab TL	111	info -> name, filename);
	112
	113	/* Get the hardware address. */
	114	if (ioctl (sock, EIOCDEVP, &param) < 0)
8ae2d595	115	log_fatal ("Can't get interface %s hardware address: %m",
179f54ab TL	116	info -> name);
	117
	118	/* We only know how to do ethernet. */
	119	if (param.end_dev_type != ENDT_10MB)
8ae2d595	120	log_fatal ("Invalid device type on network interface %s: %d",
179f54ab TL	121	info -> name, param.end_dev_type);
	122
	123	if (param.end_addr_len != 6)
8ae2d595	124	log_fatal ("Invalid hardware address length on %s: %d",
179f54ab TL	125	info -> name, param.end_addr_len);
179f54ab TL	126
218eee75 TL	127	info -> hw_address.hlen = 7;
	128	info -> hw_address.hbuf [0] = ARPHRD_ETHER;
	129	memcpy (&info -> hw_address.hbuf [1], param.end_addr, 6);
179f54ab TL	130
	131	return sock;
	132	}
	133	#endif /* USE_UPF_SEND \|\| USE_UPF_RECEIVE */
	134
	135	#ifdef USE_UPF_SEND
	136	void if_register_send (info)
	137	struct interface_info *info;
	138	{
	139	/* If we're using the upf API for sending and receiving,
	140	we don't need to register this interface twice. */
	141	#ifndef USE_UPF_RECEIVE
	142	info -> wfdesc = if_register_upf (info, interface);
	143	#else
	144	info -> wfdesc = info -> rfdesc;
	145	#endif
3648a2a1	146	if (!quiet_interface_discovery)
74f45f96	147	log_info ("Sending on UPF/%s/%s%s%s",
3648a2a1	148	info -> name,
218eee75 TL	149	print_hw_addr (info -> hw_address.hbuf [0],
	150	info -> hw_address.hlen - 1,
	151	&info -> hw_address.hbuf [1]),
74f45f96	152	(info -> shared_network ? "/" : ""),
3648a2a1	153	(info -> shared_network ?
74f45f96	154	info -> shared_network -> name : ""));
179f54ab	155	}
7203e8ee TL	156
	157	void if_deregister_send (info)
	158	struct interface_info *info;
	159	{
	160	#ifndef USE_UPF_RECEIVE
	161	close (info -> wfdesc);
	162	#endif
	163	info -> wfdesc = -1;
	164	if (!quiet_interface_discovery)
	165	log_info ("Disabling output on UPF/%s/%s%s%s",
	166	info -> name,
	167	print_hw_addr (info -> hw_address.hbuf [0],
	168	info -> hw_address.hlen - 1,
	169	&info -> hw_address.hbuf [1]),
	170	(info -> shared_network ? "/" : ""),
	171	(info -> shared_network ?
	172	info -> shared_network -> name : ""));
	173	}
179f54ab TL	174	#endif /* USE_UPF_SEND */
	175
	176	#ifdef USE_UPF_RECEIVE
	177	/* Packet filter program...
	178	XXX Changes to the filter program may require changes to the constant
	179	offsets used in if_register_send to patch the UPF program! XXX */
	180
	181
	182	void if_register_receive (info)
	183	struct interface_info *info;
	184	{
	185	int flag = 1;
	186	u_int32_t addr;
	187	struct enfilter pf;
	188	u_int32_t bits;
	189
	190	/* Open a UPF device and hang it on this interface... */
	191	info -> rfdesc = if_register_upf (info);
	192
	193	/* Allow the copyall flag to be set... */
	194	if (ioctl(info -> rfdesc, EIOCALLOWCOPYALL, &flag) < 0)
8ae2d595	195	log_fatal ("Can't set ALLOWCOPYALL: %m");
179f54ab TL	196
	197	/* Clear all the packet filter mode bits first... */
	198	flag = (ENHOLDSIG \| ENBATCH \| ENTSTAMP \| ENPROMISC \|
	199	ENNONEXCL \| ENCOPYALL);
	200	if (ioctl (info -> rfdesc, EIOCMBIC, &flag) < 0)
8ae2d595	201	log_fatal ("Can't clear pfilt bits: %m");
179f54ab TL	202
	203	/* Set the ENBATCH and ENCOPYALL bits... */
	204	bits = ENBATCH \| ENCOPYALL;
	205	if (ioctl (info -> rfdesc, EIOCMBIS, &bits) < 0)
8ae2d595	206	log_fatal ("Can't set ENBATCH\|ENCOPYALL: %m");
179f54ab TL	207
	208	/* Set up the UPF filter program. */
	209	/* XXX Unlike the BPF filter program, this one won't work if the
	210	XXX IP packet is fragmented or if there are options on the IP
	211	XXX header. */
	212	pf.enf_Priority = 0;
	213	pf.enf_FilterLen = 0;
	214
	215	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHWORD + 6;
	216	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHLIT + ENF_CAND;
	217	pf.enf_Filter [pf.enf_FilterLen++] = htons (ETHERTYPE_IP);
	218	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHLIT;
	219	pf.enf_Filter [pf.enf_FilterLen++] = htons (IPPROTO_UDP);
	220	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHWORD + 11;
	221	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHLIT + ENF_AND;
	222	pf.enf_Filter [pf.enf_FilterLen++] = htons (0xFF);
	223	pf.enf_Filter [pf.enf_FilterLen++] = ENF_CAND;
	224	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHWORD + 18;
	225	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHLIT + ENF_CAND;
	226	pf.enf_Filter [pf.enf_FilterLen++] = local_port;
	227
	228	if (ioctl (info -> rfdesc, EIOCSETF, &pf) < 0)
8ae2d595	229	log_fatal ("Can't install packet filter program: %m");
3648a2a1	230	if (!quiet_interface_discovery)
74f45f96	231	log_info ("Listening on UPF/%s/%s%s%s",
3648a2a1	232	info -> name,
218eee75 TL	233	print_hw_addr (info -> hw_address.hbuf [0],
	234	info -> hw_address.hlen - 1,
	235	&info -> hw_address.hbuf [1]),
74f45f96	236	(info -> shared_network ? "/" : ""),
3648a2a1	237	(info -> shared_network ?
74f45f96	238	info -> shared_network -> name : ""));
179f54ab	239	}
7203e8ee TL	240
	241	void if_deregister_receive (info)
	242	struct interface_info *info;
	243	{
	244	close (info -> rfdesc);
	245	info -> rfdesc = -1;
	246	if (!quiet_interface_discovery)
	247	log_info ("Disabling input on UPF/%s/%s%s%s",
	248	info -> name,
	249	print_hw_addr (info -> hw_address.hbuf [0],
	250	info -> hw_address.hlen - 1,
	251	&info -> hw_address.hbuf [1]),
	252	(info -> shared_network ? "/" : ""),
	253	(info -> shared_network ?
	254	info -> shared_network -> name : ""));
	255	}
179f54ab TL	256	#endif /* USE_UPF_RECEIVE */
	257
	258	#ifdef USE_UPF_SEND
4595a58c	259	ssize_t send_packet (interface, packet, raw, len, from, to, hto)
179f54ab TL	260	struct interface_info *interface;
	261	struct packet *packet;
	262	struct dhcp_packet *raw;
	263	size_t len;
	264	struct in_addr from;
	265	struct sockaddr_in *to;
	266	struct hardware *hto;
	267	{
8ca11339	268	unsigned bufp = 0;
179f54ab TL	269	unsigned char buf [256];
179f54ab TL	270	struct iovec iov [2];
74f45f96	271	int result;
179f54ab	272
d2bc90bd TL	273	if (!strcmp (interface -> name, "fallback"))
	274	return send_fallback (interface, packet, raw,
	275	len, from, to, hto);
	276
179f54ab TL	277	/* Assemble the headers... */
	278	assemble_hw_header (interface, buf, &bufp, hto);
	279	assemble_udp_ip_header (interface, buf, &bufp, from.s_addr,
	280	to -> sin_addr.s_addr, to -> sin_port,
	281	(unsigned char *)raw, len);
	282
	283	/* Fire it off */
	284	iov [0].iov_base = (char *)buf;
	285	iov [0].iov_len = bufp;
	286	iov [1].iov_base = (char *)raw;
	287	iov [1].iov_len = len;
	288
74f45f96 TL	289	result = writev(interface -> wfdesc, iov, 2);
74f45f96 TL	290	if (result < 0)
c5b0f529	291	log_error ("send_packet: %m");
74f45f96	292	return result;
179f54ab TL	293	}
	294	#endif /* USE_UPF_SEND */
	295
	296	#ifdef USE_UPF_RECEIVE
4595a58c	297	ssize_t receive_packet (interface, buf, len, from, hfrom)
179f54ab TL	298	struct interface_info *interface;
	299	unsigned char *buf;
	300	size_t len;
	301	struct sockaddr_in *from;
	302	struct hardware *hfrom;
	303	{
	304	int nread;
	305	int length = 0;
	306	int offset = 0;
	307	unsigned char ibuf [1500 + sizeof (struct enstamp)];
	308	int bufix = 0;
	309
	310	length = read (interface -> rfdesc, ibuf, sizeof ibuf);
	311	if (length <= 0)
	312	return length;
	313
	314	bufix = sizeof (struct enstamp);
	315	/* Decode the physical header... */
	316	offset = decode_hw_header (interface, ibuf, bufix, hfrom);
	317
	318	/* If a physical layer checksum failed (dunno of any
	319	physical layer that supports this, but WTH), skip this
	320	packet. */
	321	if (offset < 0) {
	322	return 0;
	323	}
	324
	325	bufix += offset;
	326	length -= offset;
	327
	328	/* Decode the IP and UDP headers... */
	329	offset = decode_udp_ip_header (interface, ibuf, bufix,
	330	from, (unsigned char *)0, length);
	331
	332	/* If the IP or UDP checksum was bad, skip the packet... */
	333	if (offset < 0)
	334	return 0;
	335
	336	bufix += offset;
	337	length -= offset;
	338
	339	/* Copy out the data in the packet... */
	340	memcpy (buf, &ibuf [bufix], length);
	341	return length;
	342	}
d2bc90bd	343
21d21e91 TL	344	int can_unicast_without_arp (ip)
21d21e91 TL	345	struct interface_info *ip;
d2bc90bd TL	346	{
	347	return 1;
	348	}
	349
21d21e91 TL	350	int can_receive_unicast_unconfigured (ip)
21d21e91 TL	351	struct interface_info *ip;
b547818b TL	352	{
	353	return 1;
	354	}
	355
d2bc90bd TL	356	void maybe_setup_fallback ()
d2bc90bd TL	357	{
acc21512	358	isc_result_t status;
d2bc90bd TL	359	struct interface_info *fbi;
	360	fbi = setup_fallback ();
	361	if (fbi) {
	362	if_register_fallback (fbi);
acc21512 TL	363	fbi -> refcnt = 1;
acc21512 TL	364	fbi -> type = dhcp_type_interface;
e92653f1	365	status = omapi_register_io_object ((omapi_object_t *)fbi,
acc21512 TL	366	if_readsocket, 0,
	367	fallback_discard, 0, 0);
	368	if (status != ISC_R_SUCCESS)
	369	log_fatal ("Can't register I/O handle for %s: %s",
	370	fbi -> name, isc_result_totext (status));
d2bc90bd TL	371	}
d2bc90bd TL	372	}
179f54ab	373	#endif