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

/* upf.c

   Ultrix PacketFilter interface code. */

/*
 * Copyright (c) 1996-1999 Internet Software Consortium.
 * Use is subject to license terms which appear in the file named
 * ISC-LICENSE that should have accompanied this file when you
 * received it.   If a file named ISC-LICENSE did not accompany this
 * file, or you are not sure the one you have is correct, you may
 * obtain an applicable copy of the license at:
 *
 *             http://www.isc.org/isc-license-1.0.html. 
 *
 * This file is part of the ISC DHCP distribution.   The documentation
 * associated with this file is listed in the file DOCUMENTATION,
 * included in the top-level directory of this release.
 *
 * Support and other services are available for ISC products - see
 * http://www.isc.org for more information.
 */

#ifndef lint
static char copyright[] =
"$Id: upf.c,v 1.14 1999/10/07 06:47:49 mellon Exp $ Copyright (c) 1995, 1996, 1997, 1998, 1999 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 = 6;
	info -> hw_address.htype = ARPHRD_ETHER;
	memcpy (&info -> hw_address.haddr [0], 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.htype,
				     info -> hw_address.hlen,
				     info -> hw_address.haddr),
		      (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.htype,
				     info -> hw_address.hlen,
				     info -> hw_address.haddr),
		      (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	/*
f39b6e00 TL	6	* Copyright (c) 1996-1999 Internet Software Consortium.
	7	* Use is subject to license terms which appear in the file named
	8	* ISC-LICENSE that should have accompanied this file when you
	9	* received it. If a file named ISC-LICENSE did not accompany this
	10	* file, or you are not sure the one you have is correct, you may
	11	* obtain an applicable copy of the license at:
179f54ab	12	*
f39b6e00	13	* http://www.isc.org/isc-license-1.0.html.
179f54ab	14	*
f39b6e00 TL	15	* This file is part of the ISC DHCP distribution. The documentation
	16	* associated with this file is listed in the file DOCUMENTATION,
	17	* included in the top-level directory of this release.
179f54ab	18	*
f39b6e00 TL	19	* Support and other services are available for ISC products - see
f39b6e00 TL	20	* http://www.isc.org for more information.
179f54ab TL	21	*/
	22
	23	#ifndef lint
	24	static char copyright[] =
8ca11339	25	"$Id: upf.c,v 1.14 1999/10/07 06:47:49 mellon Exp $ Copyright (c) 1995, 1996, 1997, 1998, 1999 The Internet Software Consortium. All rights reserved.\n";
179f54ab TL	26	#endif /* not lint */
	27
	28	#include "dhcpd.h"
	29	#if defined (USE_UPF_SEND) \|\| defined (USE_UPF_RECEIVE)
	30	#include <sys/ioctl.h>
	31	#include <sys/uio.h>
	32
	33	#include <net/pfilt.h>
	34	#include <netinet/in_systm.h>
	35	#include "includes/netinet/ip.h"
	36	#include "includes/netinet/udp.h"
	37	#include "includes/netinet/if_ether.h"
	38
	39	/* Reinitializes the specified interface after an address change. This
	40	is not required for packet-filter APIs. */
	41
	42	#ifdef USE_UPF_SEND
	43	void if_reinitialize_send (info)
	44	struct interface_info *info;
	45	{
	46	}
	47	#endif
	48
	49	#ifdef USE_UPF_RECEIVE
	50	void if_reinitialize_receive (info)
	51	struct interface_info *info;
	52	{
	53	}
	54	#endif
	55
	56	/* Called by get_interface_list for each interface that's discovered.
	57	Opens a packet filter for each interface and adds it to the select
	58	mask. */
	59
	60	int if_register_upf (info)
	61	struct interface_info *info;
	62	{
	63	int sock;
	64	char filename[50];
	65	int b;
	66	struct endevp param;
	67
	68	/* Open a UPF device */
	69	for (b = 0; 1; b++) {
	70	#ifndef NO_SNPRINTF
	71	snprintf(filename, sizeof(filename), "/dev/pf/pfilt%d", b);
	72	#else
	73	sprintf(filename, "/dev/pf/pfilt%d", b);
	74	#endif
	75	sock = open (filename, O_RDWR, 0);
	76	if (sock < 0) {
	77	if (errno == EBUSY) {
	78	continue;
	79	} else {
8ae2d595	80	log_fatal ("Can't find free upf: %m");
179f54ab TL	81	}
	82	} else {
	83	break;
	84	}
	85	}
	86
	87	/* Set the UPF device to point at this interface. */
	88	if (ioctl (sock, EIOCSETIF, info -> ifp) < 0)
8ae2d595	89	log_fatal ("Can't attach interface %s to upf device %s: %m",
179f54ab TL	90	info -> name, filename);
	91
	92	/* Get the hardware address. */
	93	if (ioctl (sock, EIOCDEVP, &param) < 0)
8ae2d595	94	log_fatal ("Can't get interface %s hardware address: %m",
179f54ab TL	95	info -> name);
	96
	97	/* We only know how to do ethernet. */
	98	if (param.end_dev_type != ENDT_10MB)
8ae2d595	99	log_fatal ("Invalid device type on network interface %s: %d",
179f54ab TL	100	info -> name, param.end_dev_type);
	101
	102	if (param.end_addr_len != 6)
8ae2d595	103	log_fatal ("Invalid hardware address length on %s: %d",
179f54ab TL	104	info -> name, param.end_addr_len);
	105
	106	info -> hw_address.hlen = 6;
	107	info -> hw_address.htype = ARPHRD_ETHER;
	108	memcpy (&info -> hw_address.haddr [0], param.end_addr, 6);
	109
	110	return sock;
	111	}
	112	#endif /* USE_UPF_SEND \|\| USE_UPF_RECEIVE */
	113
	114	#ifdef USE_UPF_SEND
	115	void if_register_send (info)
	116	struct interface_info *info;
	117	{
	118	/* If we're using the upf API for sending and receiving,
	119	we don't need to register this interface twice. */
	120	#ifndef USE_UPF_RECEIVE
	121	info -> wfdesc = if_register_upf (info, interface);
	122	#else
	123	info -> wfdesc = info -> rfdesc;
	124	#endif
3648a2a1	125	if (!quiet_interface_discovery)
74f45f96	126	log_info ("Sending on UPF/%s/%s%s%s",
3648a2a1 TL	127	info -> name,
	128	print_hw_addr (info -> hw_address.htype,
	129	info -> hw_address.hlen,
	130	info -> hw_address.haddr),
74f45f96	131	(info -> shared_network ? "/" : ""),
3648a2a1	132	(info -> shared_network ?
74f45f96	133	info -> shared_network -> name : ""));
179f54ab TL	134	}
	135	#endif /* USE_UPF_SEND */
	136
	137	#ifdef USE_UPF_RECEIVE
	138	/* Packet filter program...
	139	XXX Changes to the filter program may require changes to the constant
	140	offsets used in if_register_send to patch the UPF program! XXX */
	141
	142
	143	void if_register_receive (info)
	144	struct interface_info *info;
	145	{
	146	int flag = 1;
	147	u_int32_t addr;
	148	struct enfilter pf;
	149	u_int32_t bits;
	150
	151	/* Open a UPF device and hang it on this interface... */
	152	info -> rfdesc = if_register_upf (info);
	153
	154	/* Allow the copyall flag to be set... */
	155	if (ioctl(info -> rfdesc, EIOCALLOWCOPYALL, &flag) < 0)
8ae2d595	156	log_fatal ("Can't set ALLOWCOPYALL: %m");
179f54ab TL	157
	158	/* Clear all the packet filter mode bits first... */
	159	flag = (ENHOLDSIG \| ENBATCH \| ENTSTAMP \| ENPROMISC \|
	160	ENNONEXCL \| ENCOPYALL);
	161	if (ioctl (info -> rfdesc, EIOCMBIC, &flag) < 0)
8ae2d595	162	log_fatal ("Can't clear pfilt bits: %m");
179f54ab TL	163
	164	/* Set the ENBATCH and ENCOPYALL bits... */
	165	bits = ENBATCH \| ENCOPYALL;
	166	if (ioctl (info -> rfdesc, EIOCMBIS, &bits) < 0)
8ae2d595	167	log_fatal ("Can't set ENBATCH\|ENCOPYALL: %m");
179f54ab TL	168
	169	/* Set up the UPF filter program. */
	170	/* XXX Unlike the BPF filter program, this one won't work if the
	171	XXX IP packet is fragmented or if there are options on the IP
	172	XXX header. */
	173	pf.enf_Priority = 0;
	174	pf.enf_FilterLen = 0;
	175
	176	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHWORD + 6;
	177	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHLIT + ENF_CAND;
	178	pf.enf_Filter [pf.enf_FilterLen++] = htons (ETHERTYPE_IP);
	179	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHLIT;
	180	pf.enf_Filter [pf.enf_FilterLen++] = htons (IPPROTO_UDP);
	181	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHWORD + 11;
	182	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHLIT + ENF_AND;
	183	pf.enf_Filter [pf.enf_FilterLen++] = htons (0xFF);
	184	pf.enf_Filter [pf.enf_FilterLen++] = ENF_CAND;
	185	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHWORD + 18;
	186	pf.enf_Filter [pf.enf_FilterLen++] = ENF_PUSHLIT + ENF_CAND;
	187	pf.enf_Filter [pf.enf_FilterLen++] = local_port;
	188
	189	if (ioctl (info -> rfdesc, EIOCSETF, &pf) < 0)
8ae2d595	190	log_fatal ("Can't install packet filter program: %m");
3648a2a1	191	if (!quiet_interface_discovery)
74f45f96	192	log_info ("Listening on UPF/%s/%s%s%s",
3648a2a1 TL	193	info -> name,
	194	print_hw_addr (info -> hw_address.htype,
	195	info -> hw_address.hlen,
	196	info -> hw_address.haddr),
74f45f96	197	(info -> shared_network ? "/" : ""),
3648a2a1	198	(info -> shared_network ?
74f45f96	199	info -> shared_network -> name : ""));
179f54ab TL	200	}
	201	#endif /* USE_UPF_RECEIVE */
	202
	203	#ifdef USE_UPF_SEND
4595a58c	204	ssize_t send_packet (interface, packet, raw, len, from, to, hto)
179f54ab TL	205	struct interface_info *interface;
	206	struct packet *packet;
	207	struct dhcp_packet *raw;
	208	size_t len;
	209	struct in_addr from;
	210	struct sockaddr_in *to;
	211	struct hardware *hto;
	212	{
8ca11339	213	unsigned bufp = 0;
179f54ab TL	214	unsigned char buf [256];
179f54ab TL	215	struct iovec iov [2];
74f45f96	216	int result;
179f54ab	217
d2bc90bd TL	218	if (!strcmp (interface -> name, "fallback"))
	219	return send_fallback (interface, packet, raw,
	220	len, from, to, hto);
	221
179f54ab TL	222	/* Assemble the headers... */
	223	assemble_hw_header (interface, buf, &bufp, hto);
	224	assemble_udp_ip_header (interface, buf, &bufp, from.s_addr,
	225	to -> sin_addr.s_addr, to -> sin_port,
	226	(unsigned char *)raw, len);
	227
	228	/* Fire it off */
	229	iov [0].iov_base = (char *)buf;
	230	iov [0].iov_len = bufp;
	231	iov [1].iov_base = (char *)raw;
	232	iov [1].iov_len = len;
	233
74f45f96 TL	234	result = writev(interface -> wfdesc, iov, 2);
74f45f96 TL	235	if (result < 0)
c5b0f529	236	log_error ("send_packet: %m");
74f45f96	237	return result;
179f54ab TL	238	}
	239	#endif /* USE_UPF_SEND */
	240
	241	#ifdef USE_UPF_RECEIVE
4595a58c	242	ssize_t receive_packet (interface, buf, len, from, hfrom)
179f54ab TL	243	struct interface_info *interface;
	244	unsigned char *buf;
	245	size_t len;
	246	struct sockaddr_in *from;
	247	struct hardware *hfrom;
	248	{
	249	int nread;
	250	int length = 0;
	251	int offset = 0;
	252	unsigned char ibuf [1500 + sizeof (struct enstamp)];
	253	int bufix = 0;
	254
	255	length = read (interface -> rfdesc, ibuf, sizeof ibuf);
	256	if (length <= 0)
	257	return length;
	258
	259	bufix = sizeof (struct enstamp);
	260	/* Decode the physical header... */
	261	offset = decode_hw_header (interface, ibuf, bufix, hfrom);
	262
	263	/* If a physical layer checksum failed (dunno of any
	264	physical layer that supports this, but WTH), skip this
	265	packet. */
	266	if (offset < 0) {
	267	return 0;
	268	}
	269
	270	bufix += offset;
	271	length -= offset;
	272
	273	/* Decode the IP and UDP headers... */
	274	offset = decode_udp_ip_header (interface, ibuf, bufix,
	275	from, (unsigned char *)0, length);
	276
	277	/* If the IP or UDP checksum was bad, skip the packet... */
	278	if (offset < 0)
	279	return 0;
	280
	281	bufix += offset;
	282	length -= offset;
	283
	284	/* Copy out the data in the packet... */
	285	memcpy (buf, &ibuf [bufix], length);
	286	return length;
	287	}
d2bc90bd	288
21d21e91 TL	289	int can_unicast_without_arp (ip)
21d21e91 TL	290	struct interface_info *ip;
d2bc90bd TL	291	{
	292	return 1;
	293	}
	294
21d21e91 TL	295	int can_receive_unicast_unconfigured (ip)
21d21e91 TL	296	struct interface_info *ip;
b547818b TL	297	{
	298	return 1;
	299	}
	300
d2bc90bd TL	301	void maybe_setup_fallback ()
d2bc90bd TL	302	{
acc21512	303	isc_result_t status;
d2bc90bd TL	304	struct interface_info *fbi;
	305	fbi = setup_fallback ();
	306	if (fbi) {
	307	if_register_fallback (fbi);
acc21512 TL	308	fbi -> refcnt = 1;
acc21512 TL	309	fbi -> type = dhcp_type_interface;
e92653f1	310	status = omapi_register_io_object ((omapi_object_t *)fbi,
acc21512 TL	311	if_readsocket, 0,
	312	fallback_discard, 0, 0);
	313	if (status != ISC_R_SUCCESS)
	314	log_fatal ("Can't register I/O handle for %s: %s",
	315	fbi -> name, isc_result_totext (status));
d2bc90bd TL	316	}
d2bc90bd TL	317	}
179f54ab	318	#endif