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

/* upf.c

   Ultrix PacketFilter interface code. */

/*
 * Copyright (c) 2004,2007 by Internet Systems Consortium, Inc. ("ISC")
 * Copyright (c) 1996-2003 by Internet Software Consortium
 *
 * 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 ISC DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC 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.
 *
 *   Internet Systems Consortium, Inc.
 *   950 Charter Street
 *   Redwood City, CA 94063
 *   <info@isc.org>
 *   http://www.isc.org/
 *
 * This software has been written for Internet Systems Consortium
 * by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
 * To learn more about Internet Systems 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''.
 */

#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++) {
		/* %Audit% Cannot exceed 36 bytes. %2004.06.17,Safe% */
		sprintf(filename, "/dev/pf/pfilt%d", b);

		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 hbufp = 0, ibufp = 0;
	double hw [4];
	double ip [32];
	struct iovec iov [3];
	int result;
	int fudge;

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

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

	/* Fire it off */
	iov [0].iov_base = ((char *)hw);
	iov [0].iov_len = hbufp;
	iov [1].iov_base = ((char *)ip);
	iov [1].iov_len = ibufp;
	iov [2].iov_base = (char *)raw;
	iov [2].iov_len = len;

	result = writev(interface -> wfdesc, iov, 3);
	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;
	unsigned paylen;

	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, length, &paylen);

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

	bufix += offset;
	length -= offset;

	if (length < paylen)
		log_fatal("Internal inconsistency at %s:%d.", MDL);

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

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

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

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

void maybe_setup_fallback ()
{
	isc_result_t status;
	struct interface_info *fbi = (struct interface_info *)0;
	if (setup_fallback (&fbi, MDL)) {
		if_register_fallback (fbi);
		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));
		interface_dereference (&fbi, MDL);
	}
}
#endif
Commit	Line	Data
179f54ab TL	1	/* upf.c
179f54ab TL	2
2d1b06e0	3	Ultrix PacketFilter interface code. */
179f54ab TL	4
179f54ab TL	5	/*
706792c9	6	* Copyright (c) 2004,2007 by Internet Systems Consortium, Inc. ("ISC")
98311e4b	7	* Copyright (c) 1996-2003 by Internet Software Consortium
179f54ab	8	*
98311e4b DH	9	* Permission to use, copy, modify, and distribute this software for any
	10	* purpose with or without fee is hereby granted, provided that the above
	11	* copyright notice and this permission notice appear in all copies.
179f54ab	12	*
98311e4b DH	13	* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
	14	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	15	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
	16	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	17	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	18	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
	19	* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
179f54ab	20	*
98311e4b DH	21	* Internet Systems Consortium, Inc.
	22	* 950 Charter Street
	23	* Redwood City, CA 94063
	24	* <info@isc.org>
	25	* http://www.isc.org/
49733f31	26	*
98311e4b	27	* This software has been written for Internet Systems Consortium
49733f31	28	* by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
98311e4b	29	* To learn more about Internet Systems Consortium, see
49733f31 TL	30	* ``http://www.isc.org/''. To learn more about Vixie Enterprises,
	31	* see ``http://www.vix.com''. To learn more about Nominum, Inc., see
	32	* ``http://www.nominum.com''.
179f54ab TL	33	*/
179f54ab TL	34
179f54ab TL	35	#include "dhcpd.h"
	36	#if defined (USE_UPF_SEND) \|\| defined (USE_UPF_RECEIVE)
	37	#include <sys/ioctl.h>
	38	#include <sys/uio.h>
	39
	40	#include <net/pfilt.h>
	41	#include <netinet/in_systm.h>
	42	#include "includes/netinet/ip.h"
	43	#include "includes/netinet/udp.h"
	44	#include "includes/netinet/if_ether.h"
	45
	46	/* Reinitializes the specified interface after an address change. This
	47	is not required for packet-filter APIs. */
	48
	49	#ifdef USE_UPF_SEND
	50	void if_reinitialize_send (info)
	51	struct interface_info *info;
	52	{
	53	}
	54	#endif
	55
	56	#ifdef USE_UPF_RECEIVE
	57	void if_reinitialize_receive (info)
	58	struct interface_info *info;
	59	{
	60	}
	61	#endif
	62
	63	/* Called by get_interface_list for each interface that's discovered.
	64	Opens a packet filter for each interface and adds it to the select
	65	mask. */
	66
	67	int if_register_upf (info)
	68	struct interface_info *info;
	69	{
	70	int sock;
	71	char filename[50];
	72	int b;
	73	struct endevp param;
	74
	75	/* Open a UPF device */
	76	for (b = 0; 1; b++) {
98311e4b	77	/* %Audit% Cannot exceed 36 bytes. %2004.06.17,Safe% */
179f54ab	78	sprintf(filename, "/dev/pf/pfilt%d", b);
98311e4b	79
179f54ab TL	80	sock = open (filename, O_RDWR, 0);
	81	if (sock < 0) {
	82	if (errno == EBUSY) {
	83	continue;
	84	} else {
8ae2d595	85	log_fatal ("Can't find free upf: %m");
179f54ab TL	86	}
	87	} else {
	88	break;
	89	}
	90	}
	91
	92	/* Set the UPF device to point at this interface. */
	93	if (ioctl (sock, EIOCSETIF, info -> ifp) < 0)
8ae2d595	94	log_fatal ("Can't attach interface %s to upf device %s: %m",
179f54ab TL	95	info -> name, filename);
	96
	97	/* Get the hardware address. */
	98	if (ioctl (sock, EIOCDEVP, &param) < 0)
8ae2d595	99	log_fatal ("Can't get interface %s hardware address: %m",
179f54ab TL	100	info -> name);
	101
	102	/* We only know how to do ethernet. */
	103	if (param.end_dev_type != ENDT_10MB)
8ae2d595	104	log_fatal ("Invalid device type on network interface %s: %d",
179f54ab TL	105	info -> name, param.end_dev_type);
	106
	107	if (param.end_addr_len != 6)
8ae2d595	108	log_fatal ("Invalid hardware address length on %s: %d",
179f54ab TL	109	info -> name, param.end_addr_len);
179f54ab TL	110
218eee75 TL	111	info -> hw_address.hlen = 7;
	112	info -> hw_address.hbuf [0] = ARPHRD_ETHER;
	113	memcpy (&info -> hw_address.hbuf [1], param.end_addr, 6);
179f54ab TL	114
	115	return sock;
	116	}
	117	#endif /* USE_UPF_SEND \|\| USE_UPF_RECEIVE */
	118
	119	#ifdef USE_UPF_SEND
	120	void if_register_send (info)
	121	struct interface_info *info;
	122	{
	123	/* If we're using the upf API for sending and receiving,
	124	we don't need to register this interface twice. */
	125	#ifndef USE_UPF_RECEIVE
	126	info -> wfdesc = if_register_upf (info, interface);
	127	#else
	128	info -> wfdesc = info -> rfdesc;
	129	#endif
3648a2a1	130	if (!quiet_interface_discovery)
74f45f96	131	log_info ("Sending on UPF/%s/%s%s%s",
3648a2a1	132	info -> name,
218eee75 TL	133	print_hw_addr (info -> hw_address.hbuf [0],
	134	info -> hw_address.hlen - 1,
	135	&info -> hw_address.hbuf [1]),
74f45f96	136	(info -> shared_network ? "/" : ""),
3648a2a1	137	(info -> shared_network ?
74f45f96	138	info -> shared_network -> name : ""));
179f54ab	139	}
7203e8ee TL	140
	141	void if_deregister_send (info)
	142	struct interface_info *info;
	143	{
	144	#ifndef USE_UPF_RECEIVE
	145	close (info -> wfdesc);
	146	#endif
	147	info -> wfdesc = -1;
	148	if (!quiet_interface_discovery)
	149	log_info ("Disabling output on UPF/%s/%s%s%s",
	150	info -> name,
	151	print_hw_addr (info -> hw_address.hbuf [0],
	152	info -> hw_address.hlen - 1,
	153	&info -> hw_address.hbuf [1]),
	154	(info -> shared_network ? "/" : ""),
	155	(info -> shared_network ?
	156	info -> shared_network -> name : ""));
	157	}
179f54ab TL	158	#endif /* USE_UPF_SEND */
	159
	160	#ifdef USE_UPF_RECEIVE
	161	/* Packet filter program...
	162	XXX Changes to the filter program may require changes to the constant
	163	offsets used in if_register_send to patch the UPF program! XXX */
	164
	165
	166	void if_register_receive (info)
	167	struct interface_info *info;
	168	{
	169	int flag = 1;
	170	u_int32_t addr;
	171	struct enfilter pf;
	172	u_int32_t bits;
	173
	174	/* Open a UPF device and hang it on this interface... */
	175	info -> rfdesc = if_register_upf (info);
	176
	177	/* Allow the copyall flag to be set... */
	178	if (ioctl(info -> rfdesc, EIOCALLOWCOPYALL, &flag) < 0)
8ae2d595	179	log_fatal ("Can't set ALLOWCOPYALL: %m");
179f54ab TL	180
	181	/* Clear all the packet filter mode bits first... */
	182	flag = (ENHOLDSIG \| ENBATCH \| ENTSTAMP \| ENPROMISC \|
	183	ENNONEXCL \| ENCOPYALL);
	184	if (ioctl (info -> rfdesc, EIOCMBIC, &flag) < 0)
8ae2d595	185	log_fatal ("Can't clear pfilt bits: %m");
179f54ab TL	186
	187	/* Set the ENBATCH and ENCOPYALL bits... */
	188	bits = ENBATCH \| ENCOPYALL;
	189	if (ioctl (info -> rfdesc, EIOCMBIS, &bits) < 0)
8ae2d595	190	log_fatal ("Can't set ENBATCH\|ENCOPYALL: %m");
179f54ab TL	191
	192	/* Set up the UPF filter program. */
	193	/* XXX Unlike the BPF filter program, this one won't work if the
	194	XXX IP packet is fragmented or if there are options on the IP
	195	XXX header. */
	196	pf.enf_Priority = 0;
	197	pf.enf_FilterLen = 0;
	198
	199	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHWORD + 6;
	200	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHLIT + ENF_CAND;
	201	pf.enf_Filter [pf.enf_FilterLen++] = htons (ETHERTYPE_IP);
	202	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHLIT;
	203	pf.enf_Filter [pf.enf_FilterLen++] = htons (IPPROTO_UDP);
	204	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHWORD + 11;
	205	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHLIT + ENF_AND;
	206	pf.enf_Filter [pf.enf_FilterLen++] = htons (0xFF);
	207	pf.enf_Filter [pf.enf_FilterLen++] = ENF_CAND;
	208	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHWORD + 18;
	209	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHLIT + ENF_CAND;
	210	pf.enf_Filter [pf.enf_FilterLen++] = local_port;
	211
	212	if (ioctl (info -> rfdesc, EIOCSETF, &pf) < 0)
8ae2d595	213	log_fatal ("Can't install packet filter program: %m");
3648a2a1	214	if (!quiet_interface_discovery)
74f45f96	215	log_info ("Listening on UPF/%s/%s%s%s",
3648a2a1	216	info -> name,
218eee75 TL	217	print_hw_addr (info -> hw_address.hbuf [0],
	218	info -> hw_address.hlen - 1,
	219	&info -> hw_address.hbuf [1]),
74f45f96	220	(info -> shared_network ? "/" : ""),
3648a2a1	221	(info -> shared_network ?
74f45f96	222	info -> shared_network -> name : ""));
179f54ab	223	}
7203e8ee TL	224
	225	void if_deregister_receive (info)
	226	struct interface_info *info;
	227	{
	228	close (info -> rfdesc);
	229	info -> rfdesc = -1;
	230	if (!quiet_interface_discovery)
	231	log_info ("Disabling input on UPF/%s/%s%s%s",
	232	info -> name,
	233	print_hw_addr (info -> hw_address.hbuf [0],
	234	info -> hw_address.hlen - 1,
	235	&info -> hw_address.hbuf [1]),
	236	(info -> shared_network ? "/" : ""),
	237	(info -> shared_network ?
	238	info -> shared_network -> name : ""));
	239	}
179f54ab TL	240	#endif /* USE_UPF_RECEIVE */
	241
	242	#ifdef USE_UPF_SEND
4595a58c	243	ssize_t send_packet (interface, packet, raw, len, from, to, hto)
179f54ab TL	244	struct interface_info *interface;
	245	struct packet *packet;
	246	struct dhcp_packet *raw;
	247	size_t len;
	248	struct in_addr from;
	249	struct sockaddr_in *to;
	250	struct hardware *hto;
	251	{
6ceb9118 TL	252	unsigned hbufp = 0, ibufp = 0;
	253	double hw [4];
	254	double ip [32];
	255	struct iovec iov [3];
74f45f96	256	int result;
6ceb9118	257	int fudge;
179f54ab	258
d2bc90bd TL	259	if (!strcmp (interface -> name, "fallback"))
	260	return send_fallback (interface, packet, raw,
	261	len, from, to, hto);
	262
179f54ab	263	/* Assemble the headers... */
6ceb9118 TL	264	assemble_hw_header (interface, (unsigned char *)hw, &hbufp, hto);
	265	assemble_udp_ip_header (interface,
	266	(unsigned char *)ip, &ibufp, from.s_addr,
179f54ab TL	267	to -> sin_addr.s_addr, to -> sin_port,
	268	(unsigned char *)raw, len);
	269
	270	/* Fire it off */
6ceb9118 TL	271	iov [0].iov_base = ((char *)hw);
	272	iov [0].iov_len = hbufp;
	273	iov [1].iov_base = ((char *)ip);
	274	iov [1].iov_len = ibufp;
	275	iov [2].iov_base = (char *)raw;
	276	iov [2].iov_len = len;
	277
	278	result = writev(interface -> wfdesc, iov, 3);
74f45f96	279	if (result < 0)
c5b0f529	280	log_error ("send_packet: %m");
74f45f96	281	return result;
179f54ab TL	282	}
	283	#endif /* USE_UPF_SEND */
	284
	285	#ifdef USE_UPF_RECEIVE
4595a58c	286	ssize_t receive_packet (interface, buf, len, from, hfrom)
179f54ab TL	287	struct interface_info *interface;
	288	unsigned char *buf;
	289	size_t len;
	290	struct sockaddr_in *from;
	291	struct hardware *hfrom;
	292	{
	293	int nread;
	294	int length = 0;
	295	int offset = 0;
	296	unsigned char ibuf [1500 + sizeof (struct enstamp)];
	297	int bufix = 0;
83c0372e	298	unsigned paylen;
179f54ab TL	299
	300	length = read (interface -> rfdesc, ibuf, sizeof ibuf);
	301	if (length <= 0)
	302	return length;
	303
	304	bufix = sizeof (struct enstamp);
	305	/* Decode the physical header... */
	306	offset = decode_hw_header (interface, ibuf, bufix, hfrom);
	307
	308	/* If a physical layer checksum failed (dunno of any
	309	physical layer that supports this, but WTH), skip this
	310	packet. */
	311	if (offset < 0) {
	312	return 0;
	313	}
	314
	315	bufix += offset;
	316	length -= offset;
	317
	318	/* Decode the IP and UDP headers... */
	319	offset = decode_udp_ip_header (interface, ibuf, bufix,
83c0372e	320	from, length, &paylen);
179f54ab TL	321
	322	/* If the IP or UDP checksum was bad, skip the packet... */
	323	if (offset < 0)
	324	return 0;
	325
	326	bufix += offset;
	327	length -= offset;
	328
83c0372e EH	329	if (length < paylen)
	330	log_fatal("Internal inconsistency at %s:%d.", MDL);
	331
179f54ab	332	/* Copy out the data in the packet... */
83c0372e EH	333	memcpy (buf, &ibuf[bufix], paylen);
83c0372e EH	334	return paylen;
179f54ab	335	}
d2bc90bd	336
21d21e91 TL	337	int can_unicast_without_arp (ip)
21d21e91 TL	338	struct interface_info *ip;
d2bc90bd TL	339	{
	340	return 1;
	341	}
	342
21d21e91 TL	343	int can_receive_unicast_unconfigured (ip)
21d21e91 TL	344	struct interface_info *ip;
b547818b TL	345	{
	346	return 1;
	347	}
	348
5cefe5e5 TL	349	int supports_multiple_interfaces (ip)
	350	struct interface_info *ip;
	351	{
	352	return 1;
	353	}
	354
d2bc90bd TL	355	void maybe_setup_fallback ()
d2bc90bd TL	356	{
acc21512	357	isc_result_t status;
20916cae TL	358	struct interface_info fbi = (struct interface_info )0;
20916cae TL	359	if (setup_fallback (&fbi, MDL)) {
d2bc90bd	360	if_register_fallback (fbi);
e92653f1	361	status = omapi_register_io_object ((omapi_object_t *)fbi,
acc21512 TL	362	if_readsocket, 0,
	363	fallback_discard, 0, 0);
	364	if (status != ISC_R_SUCCESS)
	365	log_fatal ("Can't register I/O handle for %s: %s",
	366	fbi -> name, isc_result_totext (status));
68e1f67a	367	interface_dereference (&fbi, MDL);
d2bc90bd TL	368	}
d2bc90bd TL	369	}
179f54ab	370	#endif