xref: /minix3/external/bsd/dhcp/dist/common/nit.c (revision 83ee113ee0d94f3844d44065af2311604e9a30ad)
1*83ee113eSDavid van Moolenbroek /*	$NetBSD: nit.c,v 1.1.1.2 2014/07/12 11:57:45 spz Exp $	*/
2*83ee113eSDavid van Moolenbroek /* nit.c
3*83ee113eSDavid van Moolenbroek 
4*83ee113eSDavid van Moolenbroek    Network Interface Tap (NIT) network interface code, by Ted Lemon
5*83ee113eSDavid van Moolenbroek    with one crucial tidbit of help from Stu Grossmen. */
6*83ee113eSDavid van Moolenbroek 
7*83ee113eSDavid van Moolenbroek /*
8*83ee113eSDavid van Moolenbroek  * Copyright (c) 2004,2007,2009,2014 by Internet Systems Consortium, Inc. ("ISC")
9*83ee113eSDavid van Moolenbroek  * Copyright (c) 1996-2003 by Internet Software Consortium
10*83ee113eSDavid van Moolenbroek  *
11*83ee113eSDavid van Moolenbroek  * Permission to use, copy, modify, and distribute this software for any
12*83ee113eSDavid van Moolenbroek  * purpose with or without fee is hereby granted, provided that the above
13*83ee113eSDavid van Moolenbroek  * copyright notice and this permission notice appear in all copies.
14*83ee113eSDavid van Moolenbroek  *
15*83ee113eSDavid van Moolenbroek  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
16*83ee113eSDavid van Moolenbroek  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
17*83ee113eSDavid van Moolenbroek  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
18*83ee113eSDavid van Moolenbroek  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
19*83ee113eSDavid van Moolenbroek  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
20*83ee113eSDavid van Moolenbroek  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
21*83ee113eSDavid van Moolenbroek  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22*83ee113eSDavid van Moolenbroek  *
23*83ee113eSDavid van Moolenbroek  *   Internet Systems Consortium, Inc.
24*83ee113eSDavid van Moolenbroek  *   950 Charter Street
25*83ee113eSDavid van Moolenbroek  *   Redwood City, CA 94063
26*83ee113eSDavid van Moolenbroek  *   <info@isc.org>
27*83ee113eSDavid van Moolenbroek  *   https://www.isc.org/
28*83ee113eSDavid van Moolenbroek  *
29*83ee113eSDavid van Moolenbroek  */
30*83ee113eSDavid van Moolenbroek 
31*83ee113eSDavid van Moolenbroek #include <sys/cdefs.h>
32*83ee113eSDavid van Moolenbroek __RCSID("$NetBSD: nit.c,v 1.1.1.2 2014/07/12 11:57:45 spz Exp $");
33*83ee113eSDavid van Moolenbroek 
34*83ee113eSDavid van Moolenbroek #include "dhcpd.h"
35*83ee113eSDavid van Moolenbroek #if defined (USE_NIT_SEND) || defined (USE_NIT_RECEIVE)
36*83ee113eSDavid van Moolenbroek #include <sys/ioctl.h>
37*83ee113eSDavid van Moolenbroek #include <sys/uio.h>
38*83ee113eSDavid van Moolenbroek 
39*83ee113eSDavid van Moolenbroek #include <sys/time.h>
40*83ee113eSDavid van Moolenbroek #include <net/nit.h>
41*83ee113eSDavid van Moolenbroek #include <net/nit_if.h>
42*83ee113eSDavid van Moolenbroek #include <net/nit_pf.h>
43*83ee113eSDavid van Moolenbroek #include <net/nit_buf.h>
44*83ee113eSDavid van Moolenbroek #include <sys/stropts.h>
45*83ee113eSDavid van Moolenbroek #include <net/packetfilt.h>
46*83ee113eSDavid van Moolenbroek 
47*83ee113eSDavid van Moolenbroek #include <netinet/in_systm.h>
48*83ee113eSDavid van Moolenbroek #include "includes/netinet/ip.h"
49*83ee113eSDavid van Moolenbroek #include "includes/netinet/udp.h"
50*83ee113eSDavid van Moolenbroek #include "includes/netinet/if_ether.h"
51*83ee113eSDavid van Moolenbroek 
52*83ee113eSDavid van Moolenbroek /* Reinitializes the specified interface after an address change.   This
53*83ee113eSDavid van Moolenbroek    is not required for packet-filter APIs. */
54*83ee113eSDavid van Moolenbroek 
55*83ee113eSDavid van Moolenbroek #ifdef USE_NIT_SEND
if_reinitialize_send(info)56*83ee113eSDavid van Moolenbroek void if_reinitialize_send (info)
57*83ee113eSDavid van Moolenbroek 	struct interface_info *info;
58*83ee113eSDavid van Moolenbroek {
59*83ee113eSDavid van Moolenbroek }
60*83ee113eSDavid van Moolenbroek #endif
61*83ee113eSDavid van Moolenbroek 
62*83ee113eSDavid van Moolenbroek #ifdef USE_NIT_RECEIVE
if_reinitialize_receive(info)63*83ee113eSDavid van Moolenbroek void if_reinitialize_receive (info)
64*83ee113eSDavid van Moolenbroek 	struct interface_info *info;
65*83ee113eSDavid van Moolenbroek {
66*83ee113eSDavid van Moolenbroek }
67*83ee113eSDavid van Moolenbroek #endif
68*83ee113eSDavid van Moolenbroek 
69*83ee113eSDavid van Moolenbroek /* Called by get_interface_list for each interface that's discovered.
70*83ee113eSDavid van Moolenbroek    Opens a packet filter for each interface and adds it to the select
71*83ee113eSDavid van Moolenbroek    mask. */
72*83ee113eSDavid van Moolenbroek 
if_register_nit(info)73*83ee113eSDavid van Moolenbroek int if_register_nit (info)
74*83ee113eSDavid van Moolenbroek 	struct interface_info *info;
75*83ee113eSDavid van Moolenbroek {
76*83ee113eSDavid van Moolenbroek 	int sock;
77*83ee113eSDavid van Moolenbroek 	char filename[50];
78*83ee113eSDavid van Moolenbroek 	struct ifreq ifr;
79*83ee113eSDavid van Moolenbroek 	struct strioctl sio;
80*83ee113eSDavid van Moolenbroek 
81*83ee113eSDavid van Moolenbroek 	/* Open a NIT device */
82*83ee113eSDavid van Moolenbroek 	sock = open ("/dev/nit", O_RDWR);
83*83ee113eSDavid van Moolenbroek 	if (sock < 0)
84*83ee113eSDavid van Moolenbroek 		log_fatal ("Can't open NIT device for %s: %m", info -> name);
85*83ee113eSDavid van Moolenbroek 
86*83ee113eSDavid van Moolenbroek 	/* Set the NIT device to point at this interface. */
87*83ee113eSDavid van Moolenbroek 	sio.ic_cmd = NIOCBIND;
88*83ee113eSDavid van Moolenbroek 	sio.ic_len = sizeof *(info -> ifp);
89*83ee113eSDavid van Moolenbroek 	sio.ic_dp = (char *)(info -> ifp);
90*83ee113eSDavid van Moolenbroek 	sio.ic_timout = INFTIM;
91*83ee113eSDavid van Moolenbroek 	if (ioctl (sock, I_STR, &sio) < 0)
92*83ee113eSDavid van Moolenbroek 		log_fatal ("Can't attach interface %s to nit device: %m",
93*83ee113eSDavid van Moolenbroek 		       info -> name);
94*83ee113eSDavid van Moolenbroek 
95*83ee113eSDavid van Moolenbroek 	/* Get the low-level address... */
96*83ee113eSDavid van Moolenbroek 	sio.ic_cmd = SIOCGIFADDR;
97*83ee113eSDavid van Moolenbroek 	sio.ic_len = sizeof ifr;
98*83ee113eSDavid van Moolenbroek 	sio.ic_dp = (char *)&ifr;
99*83ee113eSDavid van Moolenbroek 	sio.ic_timout = INFTIM;
100*83ee113eSDavid van Moolenbroek 	if (ioctl (sock, I_STR, &sio) < 0)
101*83ee113eSDavid van Moolenbroek 		log_fatal ("Can't get physical layer address for %s: %m",
102*83ee113eSDavid van Moolenbroek 		       info -> name);
103*83ee113eSDavid van Moolenbroek 
104*83ee113eSDavid van Moolenbroek 	/* XXX code below assumes ethernet interface! */
105*83ee113eSDavid van Moolenbroek 	info -> hw_address.hlen = 7;
106*83ee113eSDavid van Moolenbroek 	info -> hw_address.hbuf [0] = ARPHRD_ETHER;
107*83ee113eSDavid van Moolenbroek 	memcpy (&info -> hw_address.hbuf [1],
108*83ee113eSDavid van Moolenbroek 		ifr.ifr_ifru.ifru_addr.sa_data, 6);
109*83ee113eSDavid van Moolenbroek 
110*83ee113eSDavid van Moolenbroek 	if (ioctl (sock, I_PUSH, "pf") < 0)
111*83ee113eSDavid van Moolenbroek 		log_fatal ("Can't push packet filter onto NIT for %s: %m",
112*83ee113eSDavid van Moolenbroek 		       info -> name);
113*83ee113eSDavid van Moolenbroek 
114*83ee113eSDavid van Moolenbroek 	return sock;
115*83ee113eSDavid van Moolenbroek }
116*83ee113eSDavid van Moolenbroek #endif /* USE_NIT_SEND || USE_NIT_RECEIVE */
117*83ee113eSDavid van Moolenbroek 
118*83ee113eSDavid van Moolenbroek #ifdef USE_NIT_SEND
if_register_send(info)119*83ee113eSDavid van Moolenbroek void if_register_send (info)
120*83ee113eSDavid van Moolenbroek 	struct interface_info *info;
121*83ee113eSDavid van Moolenbroek {
122*83ee113eSDavid van Moolenbroek 	/* If we're using the nit API for sending and receiving,
123*83ee113eSDavid van Moolenbroek 	   we don't need to register this interface twice. */
124*83ee113eSDavid van Moolenbroek #ifndef USE_NIT_RECEIVE
125*83ee113eSDavid van Moolenbroek 	struct packetfilt pf;
126*83ee113eSDavid van Moolenbroek 	struct strioctl sio;
127*83ee113eSDavid van Moolenbroek 
128*83ee113eSDavid van Moolenbroek 	info -> wfdesc = if_register_nit (info);
129*83ee113eSDavid van Moolenbroek 
130*83ee113eSDavid van Moolenbroek 	pf.Pf_Priority = 0;
131*83ee113eSDavid van Moolenbroek 	pf.Pf_FilterLen = 1;
132*83ee113eSDavid van Moolenbroek 	pf.Pf_Filter [0] = ENF_PUSHZERO;
133*83ee113eSDavid van Moolenbroek 
134*83ee113eSDavid van Moolenbroek 	/* Set up an NIT filter that rejects everything... */
135*83ee113eSDavid van Moolenbroek 	sio.ic_cmd = NIOCSETF;
136*83ee113eSDavid van Moolenbroek 	sio.ic_len = sizeof pf;
137*83ee113eSDavid van Moolenbroek 	sio.ic_dp = (char *)&pf;
138*83ee113eSDavid van Moolenbroek 	sio.ic_timout = INFTIM;
139*83ee113eSDavid van Moolenbroek 	if (ioctl (info -> wfdesc, I_STR, &sio) < 0)
140*83ee113eSDavid van Moolenbroek 		log_fatal ("Can't set NIT filter: %m");
141*83ee113eSDavid van Moolenbroek #else
142*83ee113eSDavid van Moolenbroek 	info -> wfdesc = info -> rfdesc;
143*83ee113eSDavid van Moolenbroek #endif
144*83ee113eSDavid van Moolenbroek         if (!quiet_interface_discovery)
145*83ee113eSDavid van Moolenbroek 		log_info ("Sending on   NIT/%s%s%s",
146*83ee113eSDavid van Moolenbroek 		      print_hw_addr (info -> hw_address.hbuf [0],
147*83ee113eSDavid van Moolenbroek 				     info -> hw_address.hlen - 1,
148*83ee113eSDavid van Moolenbroek 				     &info -> hw_address.hbuf [1]),
149*83ee113eSDavid van Moolenbroek 		      (info -> shared_network ? "/" : ""),
150*83ee113eSDavid van Moolenbroek 		      (info -> shared_network ?
151*83ee113eSDavid van Moolenbroek 		       info -> shared_network -> name : ""));
152*83ee113eSDavid van Moolenbroek }
153*83ee113eSDavid van Moolenbroek 
if_deregister_send(info)154*83ee113eSDavid van Moolenbroek void if_deregister_send (info)
155*83ee113eSDavid van Moolenbroek 	struct interface_info *info;
156*83ee113eSDavid van Moolenbroek {
157*83ee113eSDavid van Moolenbroek 	/* If we're using the nit API for sending and receiving,
158*83ee113eSDavid van Moolenbroek 	   we don't need to register this interface twice. */
159*83ee113eSDavid van Moolenbroek #ifndef USE_NIT_RECEIVE
160*83ee113eSDavid van Moolenbroek 	close (info -> wfdesc);
161*83ee113eSDavid van Moolenbroek #endif
162*83ee113eSDavid van Moolenbroek 	info -> wfdesc = -1;
163*83ee113eSDavid van Moolenbroek         if (!quiet_interface_discovery)
164*83ee113eSDavid van Moolenbroek 		log_info ("Disabling output on NIT/%s%s%s",
165*83ee113eSDavid van Moolenbroek 		      print_hw_addr (info -> hw_address.hbuf [0],
166*83ee113eSDavid van Moolenbroek 				     info -> hw_address.hlen - 1,
167*83ee113eSDavid van Moolenbroek 				     &info -> hw_address.hbuf [1]),
168*83ee113eSDavid van Moolenbroek 		      (info -> shared_network ? "/" : ""),
169*83ee113eSDavid van Moolenbroek 		      (info -> shared_network ?
170*83ee113eSDavid van Moolenbroek 		       info -> shared_network -> name : ""));
171*83ee113eSDavid van Moolenbroek }
172*83ee113eSDavid van Moolenbroek #endif /* USE_NIT_SEND */
173*83ee113eSDavid van Moolenbroek 
174*83ee113eSDavid van Moolenbroek #ifdef USE_NIT_RECEIVE
175*83ee113eSDavid van Moolenbroek /* Packet filter program...
176*83ee113eSDavid van Moolenbroek    XXX Changes to the filter program may require changes to the constant
177*83ee113eSDavid van Moolenbroek    offsets used in if_register_send to patch the NIT program! XXX */
178*83ee113eSDavid van Moolenbroek 
if_register_receive(info)179*83ee113eSDavid van Moolenbroek void if_register_receive (info)
180*83ee113eSDavid van Moolenbroek 	struct interface_info *info;
181*83ee113eSDavid van Moolenbroek {
182*83ee113eSDavid van Moolenbroek 	int flag = 1;
183*83ee113eSDavid van Moolenbroek 	u_int32_t x;
184*83ee113eSDavid van Moolenbroek 	struct packetfilt pf;
185*83ee113eSDavid van Moolenbroek 	struct strioctl sio;
186*83ee113eSDavid van Moolenbroek 	u_int16_t addr [2];
187*83ee113eSDavid van Moolenbroek 	struct timeval t;
188*83ee113eSDavid van Moolenbroek 
189*83ee113eSDavid van Moolenbroek 	/* Open a NIT device and hang it on this interface... */
190*83ee113eSDavid van Moolenbroek 	info -> rfdesc = if_register_nit (info);
191*83ee113eSDavid van Moolenbroek 
192*83ee113eSDavid van Moolenbroek 	/* Set the snap length to 0, which means always take the whole
193*83ee113eSDavid van Moolenbroek 	   packet. */
194*83ee113eSDavid van Moolenbroek 	x = 0;
195*83ee113eSDavid van Moolenbroek 	if (ioctl (info -> rfdesc, NIOCSSNAP, &x) < 0)
196*83ee113eSDavid van Moolenbroek 		log_fatal ("Can't set NIT snap length on %s: %m", info -> name);
197*83ee113eSDavid van Moolenbroek 
198*83ee113eSDavid van Moolenbroek 	/* Set the stream to byte stream mode */
199*83ee113eSDavid van Moolenbroek 	if (ioctl (info -> rfdesc, I_SRDOPT, RMSGN) != 0)
200*83ee113eSDavid van Moolenbroek 		log_info ("I_SRDOPT failed on %s: %m", info -> name);
201*83ee113eSDavid van Moolenbroek 
202*83ee113eSDavid van Moolenbroek #if 0
203*83ee113eSDavid van Moolenbroek 	/* Push on the chunker... */
204*83ee113eSDavid van Moolenbroek 	if (ioctl (info -> rfdesc, I_PUSH, "nbuf") < 0)
205*83ee113eSDavid van Moolenbroek 		log_fatal ("Can't push chunker onto NIT STREAM: %m");
206*83ee113eSDavid van Moolenbroek 
207*83ee113eSDavid van Moolenbroek 	/* Set the timeout to zero. */
208*83ee113eSDavid van Moolenbroek 	t.tv_sec = 0;
209*83ee113eSDavid van Moolenbroek 	t.tv_usec = 0;
210*83ee113eSDavid van Moolenbroek 	if (ioctl (info -> rfdesc, NIOCSTIME, &t) < 0)
211*83ee113eSDavid van Moolenbroek 		log_fatal ("Can't set chunk timeout: %m");
212*83ee113eSDavid van Moolenbroek #endif
213*83ee113eSDavid van Moolenbroek 
214*83ee113eSDavid van Moolenbroek 	/* Ask for no header... */
215*83ee113eSDavid van Moolenbroek 	x = 0;
216*83ee113eSDavid van Moolenbroek 	if (ioctl (info -> rfdesc, NIOCSFLAGS, &x) < 0)
217*83ee113eSDavid van Moolenbroek 		log_fatal ("Can't set NIT flags on %s: %m", info -> name);
218*83ee113eSDavid van Moolenbroek 
219*83ee113eSDavid van Moolenbroek 	/* Set up the NIT filter program. */
220*83ee113eSDavid van Moolenbroek 	/* XXX Unlike the BPF filter program, this one won't work if the
221*83ee113eSDavid van Moolenbroek 	   XXX IP packet is fragmented or if there are options on the IP
222*83ee113eSDavid van Moolenbroek 	   XXX header. */
223*83ee113eSDavid van Moolenbroek 	pf.Pf_Priority = 0;
224*83ee113eSDavid van Moolenbroek 	pf.Pf_FilterLen = 0;
225*83ee113eSDavid van Moolenbroek 
226*83ee113eSDavid van Moolenbroek 	pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHWORD + 6;
227*83ee113eSDavid van Moolenbroek 	pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHLIT + ENF_CAND;
228*83ee113eSDavid van Moolenbroek 	pf.Pf_Filter [pf.Pf_FilterLen++] = htons (ETHERTYPE_IP);
229*83ee113eSDavid van Moolenbroek 	pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHLIT;
230*83ee113eSDavid van Moolenbroek 	pf.Pf_Filter [pf.Pf_FilterLen++] = htons (IPPROTO_UDP);
231*83ee113eSDavid van Moolenbroek 	pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHWORD + 11;
232*83ee113eSDavid van Moolenbroek 	pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHLIT + ENF_AND;
233*83ee113eSDavid van Moolenbroek 	pf.Pf_Filter [pf.Pf_FilterLen++] = htons (0xFF);
234*83ee113eSDavid van Moolenbroek 	pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_CAND;
235*83ee113eSDavid van Moolenbroek 	pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHWORD + 18;
236*83ee113eSDavid van Moolenbroek 	pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHLIT + ENF_CAND;
237*83ee113eSDavid van Moolenbroek 	pf.Pf_Filter [pf.Pf_FilterLen++] = local_port;
238*83ee113eSDavid van Moolenbroek 
239*83ee113eSDavid van Moolenbroek 	/* Install the filter... */
240*83ee113eSDavid van Moolenbroek 	sio.ic_cmd = NIOCSETF;
241*83ee113eSDavid van Moolenbroek 	sio.ic_len = sizeof pf;
242*83ee113eSDavid van Moolenbroek 	sio.ic_dp = (char *)&pf;
243*83ee113eSDavid van Moolenbroek 	sio.ic_timout = INFTIM;
244*83ee113eSDavid van Moolenbroek 	if (ioctl (info -> rfdesc, I_STR, &sio) < 0)
245*83ee113eSDavid van Moolenbroek 		log_fatal ("Can't set NIT filter on %s: %m", info -> name);
246*83ee113eSDavid van Moolenbroek 
247*83ee113eSDavid van Moolenbroek         if (!quiet_interface_discovery)
248*83ee113eSDavid van Moolenbroek 		log_info ("Listening on NIT/%s%s%s",
249*83ee113eSDavid van Moolenbroek 		      print_hw_addr (info -> hw_address.hbuf [0],
250*83ee113eSDavid van Moolenbroek 				     info -> hw_address.hlen - 1,
251*83ee113eSDavid van Moolenbroek 				     &info -> hw_address.hbuf [1]),
252*83ee113eSDavid van Moolenbroek 		      (info -> shared_network ? "/" : ""),
253*83ee113eSDavid van Moolenbroek 		      (info -> shared_network ?
254*83ee113eSDavid van Moolenbroek 		       info -> shared_network -> name : ""));
255*83ee113eSDavid van Moolenbroek }
256*83ee113eSDavid van Moolenbroek 
if_deregister_receive(info)257*83ee113eSDavid van Moolenbroek void if_deregister_receive (info)
258*83ee113eSDavid van Moolenbroek 	struct interface_info *info;
259*83ee113eSDavid van Moolenbroek {
260*83ee113eSDavid van Moolenbroek 	/* If we're using the nit API for sending and receiving,
261*83ee113eSDavid van Moolenbroek 	   we don't need to register this interface twice. */
262*83ee113eSDavid van Moolenbroek 	close (info -> rfdesc);
263*83ee113eSDavid van Moolenbroek 	info -> rfdesc = -1;
264*83ee113eSDavid van Moolenbroek 
265*83ee113eSDavid van Moolenbroek         if (!quiet_interface_discovery)
266*83ee113eSDavid van Moolenbroek 		log_info ("Disabling input on NIT/%s%s%s",
267*83ee113eSDavid van Moolenbroek 		      print_hw_addr (info -> hw_address.hbuf [0],
268*83ee113eSDavid van Moolenbroek 				     info -> hw_address.hlen - 1,
269*83ee113eSDavid van Moolenbroek 				     &info -> hw_address.hbuf [1]),
270*83ee113eSDavid van Moolenbroek 		      (info -> shared_network ? "/" : ""),
271*83ee113eSDavid van Moolenbroek 		      (info -> shared_network ?
272*83ee113eSDavid van Moolenbroek 		       info -> shared_network -> name : ""));
273*83ee113eSDavid van Moolenbroek }
274*83ee113eSDavid van Moolenbroek #endif /* USE_NIT_RECEIVE */
275*83ee113eSDavid van Moolenbroek 
276*83ee113eSDavid van Moolenbroek #ifdef USE_NIT_SEND
send_packet(interface,packet,raw,len,from,to,hto)277*83ee113eSDavid van Moolenbroek ssize_t send_packet (interface, packet, raw, len, from, to, hto)
278*83ee113eSDavid van Moolenbroek 	struct interface_info *interface;
279*83ee113eSDavid van Moolenbroek 	struct packet *packet;
280*83ee113eSDavid van Moolenbroek 	struct dhcp_packet *raw;
281*83ee113eSDavid van Moolenbroek 	size_t len;
282*83ee113eSDavid van Moolenbroek 	struct in_addr from;
283*83ee113eSDavid van Moolenbroek 	struct sockaddr_in *to;
284*83ee113eSDavid van Moolenbroek 	struct hardware *hto;
285*83ee113eSDavid van Moolenbroek {
286*83ee113eSDavid van Moolenbroek 	unsigned hbufp, ibufp;
287*83ee113eSDavid van Moolenbroek 	double hh [16];
288*83ee113eSDavid van Moolenbroek 	double ih [1536 / sizeof (double)];
289*83ee113eSDavid van Moolenbroek 	unsigned char *buf = (unsigned char *)ih;
290*83ee113eSDavid van Moolenbroek 	struct sockaddr *junk;
291*83ee113eSDavid van Moolenbroek 	struct strbuf ctl, data;
292*83ee113eSDavid van Moolenbroek 	struct sockaddr_in foo;
293*83ee113eSDavid van Moolenbroek 	int result;
294*83ee113eSDavid van Moolenbroek 
295*83ee113eSDavid van Moolenbroek 	if (!strcmp (interface -> name, "fallback"))
296*83ee113eSDavid van Moolenbroek 		return send_fallback (interface, packet, raw,
297*83ee113eSDavid van Moolenbroek 				      len, from, to, hto);
298*83ee113eSDavid van Moolenbroek 
299*83ee113eSDavid van Moolenbroek 	if (hto == NULL && interface->anycast_mac_addr.hlen)
300*83ee113eSDavid van Moolenbroek 		hto = &interface->anycast_mac_addr;
301*83ee113eSDavid van Moolenbroek 
302*83ee113eSDavid van Moolenbroek 	/* Start with the sockaddr struct... */
303*83ee113eSDavid van Moolenbroek 	junk = (struct sockaddr *)&hh [0];
304*83ee113eSDavid van Moolenbroek 	hbufp = (((unsigned char *)&junk -> sa_data [0]) -
305*83ee113eSDavid van Moolenbroek 		 (unsigned char *)&hh[0]);
306*83ee113eSDavid van Moolenbroek 	ibufp = 0;
307*83ee113eSDavid van Moolenbroek 
308*83ee113eSDavid van Moolenbroek 	/* Assemble the headers... */
309*83ee113eSDavid van Moolenbroek 	assemble_hw_header (interface, (unsigned char *)junk, &hbufp, hto);
310*83ee113eSDavid van Moolenbroek 	assemble_udp_ip_header (interface, buf, &ibufp,
311*83ee113eSDavid van Moolenbroek 				from.s_addr, to -> sin_addr.s_addr,
312*83ee113eSDavid van Moolenbroek 				to -> sin_port, (unsigned char *)raw, len);
313*83ee113eSDavid van Moolenbroek 
314*83ee113eSDavid van Moolenbroek 	/* Copy the data into the buffer (yuk). */
315*83ee113eSDavid van Moolenbroek 	memcpy (buf + ibufp, raw, len);
316*83ee113eSDavid van Moolenbroek 
317*83ee113eSDavid van Moolenbroek 	/* Set up the sockaddr structure... */
318*83ee113eSDavid van Moolenbroek #if USE_SIN_LEN
319*83ee113eSDavid van Moolenbroek 	junk -> sa_len = hbufp - 2; /* XXX */
320*83ee113eSDavid van Moolenbroek #endif
321*83ee113eSDavid van Moolenbroek 	junk -> sa_family = AF_UNSPEC;
322*83ee113eSDavid van Moolenbroek 
323*83ee113eSDavid van Moolenbroek 	/* Set up the msg_buf structure... */
324*83ee113eSDavid van Moolenbroek 	ctl.buf = (char *)&hh [0];
325*83ee113eSDavid van Moolenbroek 	ctl.maxlen = ctl.len = hbufp;
326*83ee113eSDavid van Moolenbroek 	data.buf = (char *)&ih [0];
327*83ee113eSDavid van Moolenbroek 	data.maxlen = data.len = ibufp + len;
328*83ee113eSDavid van Moolenbroek 
329*83ee113eSDavid van Moolenbroek 	result = putmsg (interface -> wfdesc, &ctl, &data, 0);
330*83ee113eSDavid van Moolenbroek 	if (result < 0)
331*83ee113eSDavid van Moolenbroek 		log_error ("send_packet: %m");
332*83ee113eSDavid van Moolenbroek 	return result;
333*83ee113eSDavid van Moolenbroek }
334*83ee113eSDavid van Moolenbroek #endif /* USE_NIT_SEND */
335*83ee113eSDavid van Moolenbroek 
336*83ee113eSDavid van Moolenbroek #ifdef USE_NIT_RECEIVE
receive_packet(interface,buf,len,from,hfrom)337*83ee113eSDavid van Moolenbroek ssize_t receive_packet (interface, buf, len, from, hfrom)
338*83ee113eSDavid van Moolenbroek 	struct interface_info *interface;
339*83ee113eSDavid van Moolenbroek 	unsigned char *buf;
340*83ee113eSDavid van Moolenbroek 	size_t len;
341*83ee113eSDavid van Moolenbroek 	struct sockaddr_in *from;
342*83ee113eSDavid van Moolenbroek 	struct hardware *hfrom;
343*83ee113eSDavid van Moolenbroek {
344*83ee113eSDavid van Moolenbroek 	int nread;
345*83ee113eSDavid van Moolenbroek 	int length = 0;
346*83ee113eSDavid van Moolenbroek 	int offset = 0;
347*83ee113eSDavid van Moolenbroek 	unsigned char ibuf [1536];
348*83ee113eSDavid van Moolenbroek 	int bufix = 0;
349*83ee113eSDavid van Moolenbroek 	unsigned paylen;
350*83ee113eSDavid van Moolenbroek 
351*83ee113eSDavid van Moolenbroek 	length = read (interface -> rfdesc, ibuf, sizeof ibuf);
352*83ee113eSDavid van Moolenbroek 	if (length <= 0)
353*83ee113eSDavid van Moolenbroek 		return length;
354*83ee113eSDavid van Moolenbroek 
355*83ee113eSDavid van Moolenbroek 	/* Decode the physical header... */
356*83ee113eSDavid van Moolenbroek 	offset = decode_hw_header (interface, ibuf, bufix, hfrom);
357*83ee113eSDavid van Moolenbroek 
358*83ee113eSDavid van Moolenbroek 	/* If a physical layer checksum failed (dunno of any
359*83ee113eSDavid van Moolenbroek 	   physical layer that supports this, but WTH), skip this
360*83ee113eSDavid van Moolenbroek 	   packet. */
361*83ee113eSDavid van Moolenbroek 	if (offset < 0) {
362*83ee113eSDavid van Moolenbroek 		return 0;
363*83ee113eSDavid van Moolenbroek 	}
364*83ee113eSDavid van Moolenbroek 
365*83ee113eSDavid van Moolenbroek 	bufix += offset;
366*83ee113eSDavid van Moolenbroek 	length -= offset;
367*83ee113eSDavid van Moolenbroek 
368*83ee113eSDavid van Moolenbroek 	/* Decode the IP and UDP headers... */
369*83ee113eSDavid van Moolenbroek 	offset = decode_udp_ip_header (interface, ibuf, bufix,
370*83ee113eSDavid van Moolenbroek 				       from, length, &paylen);
371*83ee113eSDavid van Moolenbroek 
372*83ee113eSDavid van Moolenbroek 	/* If the IP or UDP checksum was bad, skip the packet... */
373*83ee113eSDavid van Moolenbroek 	if (offset < 0)
374*83ee113eSDavid van Moolenbroek 		return 0;
375*83ee113eSDavid van Moolenbroek 
376*83ee113eSDavid van Moolenbroek 	bufix += offset;
377*83ee113eSDavid van Moolenbroek 	length -= offset;
378*83ee113eSDavid van Moolenbroek 
379*83ee113eSDavid van Moolenbroek 	if (length < paylen)
380*83ee113eSDavid van Moolenbroek 		log_fatal("Internal inconsistency at %s:%d.", MDL);
381*83ee113eSDavid van Moolenbroek 
382*83ee113eSDavid van Moolenbroek 	/* Copy out the data in the packet... */
383*83ee113eSDavid van Moolenbroek 	memcpy(buf, &ibuf[bufix], paylen);
384*83ee113eSDavid van Moolenbroek 	return paylen;
385*83ee113eSDavid van Moolenbroek }
386*83ee113eSDavid van Moolenbroek 
can_unicast_without_arp(ip)387*83ee113eSDavid van Moolenbroek int can_unicast_without_arp (ip)
388*83ee113eSDavid van Moolenbroek 	struct interface_info *ip;
389*83ee113eSDavid van Moolenbroek {
390*83ee113eSDavid van Moolenbroek 	return 1;
391*83ee113eSDavid van Moolenbroek }
392*83ee113eSDavid van Moolenbroek 
can_receive_unicast_unconfigured(ip)393*83ee113eSDavid van Moolenbroek int can_receive_unicast_unconfigured (ip)
394*83ee113eSDavid van Moolenbroek 	struct interface_info *ip;
395*83ee113eSDavid van Moolenbroek {
396*83ee113eSDavid van Moolenbroek 	return 1;
397*83ee113eSDavid van Moolenbroek }
398*83ee113eSDavid van Moolenbroek 
supports_multiple_interfaces(ip)399*83ee113eSDavid van Moolenbroek int supports_multiple_interfaces (ip)
400*83ee113eSDavid van Moolenbroek 	struct interface_info *ip;
401*83ee113eSDavid van Moolenbroek {
402*83ee113eSDavid van Moolenbroek 	return 1;
403*83ee113eSDavid van Moolenbroek }
404*83ee113eSDavid van Moolenbroek 
maybe_setup_fallback()405*83ee113eSDavid van Moolenbroek void maybe_setup_fallback ()
406*83ee113eSDavid van Moolenbroek {
407*83ee113eSDavid van Moolenbroek 	isc_result_t status;
408*83ee113eSDavid van Moolenbroek 	struct interface_info *fbi = (struct interface_info *)0;
409*83ee113eSDavid van Moolenbroek 	if (setup_fallback (&fbi, MDL)) {
410*83ee113eSDavid van Moolenbroek 		if_register_fallback (fbi);
411*83ee113eSDavid van Moolenbroek 		status = omapi_register_io_object ((omapi_object_t *)fbi,
412*83ee113eSDavid van Moolenbroek 						   if_readsocket, 0,
413*83ee113eSDavid van Moolenbroek 						   fallback_discard, 0, 0);
414*83ee113eSDavid van Moolenbroek 		if (status != ISC_R_SUCCESS)
415*83ee113eSDavid van Moolenbroek 			log_fatal ("Can't register I/O handle for %s: %s",
416*83ee113eSDavid van Moolenbroek 				   fbi -> name, isc_result_totext (status));
417*83ee113eSDavid van Moolenbroek 		interface_dereference (&fbi, MDL);
418*83ee113eSDavid van Moolenbroek 	}
419*83ee113eSDavid van Moolenbroek }
420*83ee113eSDavid van Moolenbroek #endif
421