if_enc.c revision 1.38 
1/*	$OpenBSD: if_enc.c,v 1.38 2002/05/29 07:54:58 itojun Exp $	*/
2/*
3 * The authors of this code are John Ioannidis (ji@tla.org),
4 * Angelos D. Keromytis (kermit@csd.uch.gr) and
5 * Niels Provos (provos@physnet.uni-hamburg.de).
6 *
7 * This code was written by John Ioannidis for BSD/OS in Athens, Greece,
8 * in November 1995.
9 *
10 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
11 * by Angelos D. Keromytis.
12 *
13 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
14 * and Niels Provos.
15 *
16 * Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis
17 * and Niels Provos.
18 * Copyright (c) 2001, Angelos D. Keromytis.
19 *
20 * Permission to use, copy, and modify this software with or without fee
21 * is hereby granted, provided that this entire notice is included in
22 * all copies of any software which is or includes a copy or
23 * modification of this software.
24 * You may use this code under the GNU public license if you so wish. Please
25 * contribute changes back to the authors under this freer than GPL license
26 * so that we may further the use of strong encryption without limitations to
27 * all.
28 *
29 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
30 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
31 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
32 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
33 * PURPOSE.
34 */
35
36/*
37 * Encapsulation interface driver.
38 */
39
40#include <sys/param.h>
41#include <sys/systm.h>
42#include <sys/mbuf.h>
43#include <sys/socket.h>
44#include <sys/ioctl.h>
45
46#include <net/if.h>
47#include <net/if_types.h>
48#include <net/route.h>
49#include <net/bpf.h>
50
51#include <net/if_enc.h>
52
53#ifdef	INET
54#include <netinet/in.h>
55#include <netinet/in_var.h>
56#endif
57
58#ifdef INET6
59#ifndef INET
60#include <netinet/in.h>
61#endif
62#include <netinet6/nd6.h>
63#endif /* INET6 */
64
65#ifdef ISO
66extern struct ifqueue clnlintrq;
67#endif
68
69#ifdef NS
70extern struct ifqueue nsintrq;
71#endif
72
73#include "bpfilter.h"
74#include "enc.h"
75
76#ifdef ENCDEBUG
77#define DPRINTF(x)    do { if (encdebug) printf x ; } while (0)
78#else
79#define DPRINTF(x)
80#endif
81
82struct enc_softc encif[NENC];
83
84void	encattach(int);
85int	encoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
86	    	       struct rtentry *);
87int	encioctl(struct ifnet *, u_long, caddr_t);
88void	encrtrequest(int, struct rtentry *, struct sockaddr *);
89void	encstart(struct ifnet *);
90
91extern int ifqmaxlen;
92
93void
94encattach(int nenc)
95{
96    struct ifnet *ifp;
97    int i;
98
99    bzero(encif, sizeof(encif));
100
101    for (i = 0; i < NENC; i++)
102    {
103	ifp = &encif[i].sc_if;
104	sprintf(ifp->if_xname, "enc%d", i);
105	ifp->if_softc = &encif[i];
106	ifp->if_mtu = ENCMTU;
107	ifp->if_ioctl = encioctl;
108	ifp->if_output = encoutput;
109	ifp->if_start = encstart;
110	ifp->if_type = IFT_ENC;
111	ifp->if_snd.ifq_maxlen = ifqmaxlen;
112	ifp->if_hdrlen = ENC_HDRLEN;
113	if_attach(ifp);
114
115#if NBPFILTER > 0
116	bpfattach(&encif[i].sc_if.if_bpf, ifp, DLT_ENC, ENC_HDRLEN);
117#endif
118    }
119}
120
121/*
122 * Start output on the enc interface.
123 */
124void
125encstart(ifp)
126struct ifnet *ifp;
127{
128    struct mbuf *m;
129    int s;
130
131    for (;;)
132    {
133        s = splimp();
134	IF_DROP(&ifp->if_snd);
135        IF_DEQUEUE(&ifp->if_snd, m);
136        splx(s);
137
138        if (m == NULL)
139          return;
140        else
141          m_freem(m);
142    }
143}
144
145int
146encoutput(ifp, m, dst, rt)
147struct ifnet *ifp;
148register struct mbuf *m;
149struct sockaddr *dst;
150register struct rtentry *rt;
151{
152    m_freem(m);
153    return (0);
154}
155
156/* ARGSUSED */
157void
158encrtrequest(cmd, rt, sa)
159int cmd;
160struct rtentry *rt;
161struct sockaddr *sa;
162{
163    if (rt)
164      rt->rt_rmx.rmx_mtu = ENCMTU;
165}
166
167/* ARGSUSED */
168int
169encioctl(ifp, cmd, data)
170register struct ifnet *ifp;
171u_long cmd;
172caddr_t data;
173{
174    switch (cmd)
175    {
176	case SIOCSIFADDR:
177	case SIOCAIFADDR:
178	case SIOCSIFDSTADDR:
179	case SIOCSIFFLAGS:
180	    if (ifp->if_flags & IFF_UP)
181	      ifp->if_flags |= IFF_RUNNING;
182	    else
183	      ifp->if_flags &= ~IFF_RUNNING;
184	    break;
185
186	default:
187	    return (EINVAL);
188    }
189
190    return 0;
191}
192