if_enc.c revision 1.44 
1/*	$OpenBSD: if_enc.c,v 1.44 2006/06/28 12:02:26 claudio 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#include "bpfilter.h"
66#include "enc.h"
67
68#ifdef ENCDEBUG
69#define DPRINTF(x)    do { if (encdebug) printf x ; } while (0)
70#else
71#define DPRINTF(x)
72#endif
73
74struct enc_softc encif[NENC];
75
76void	encattach(int);
77int	encoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
78	    	       struct rtentry *);
79int	encioctl(struct ifnet *, u_long, caddr_t);
80void	encstart(struct ifnet *);
81
82extern int ifqmaxlen;
83
84void
85encattach(int nenc)
86{
87    struct ifnet *ifp;
88    int i;
89
90    bzero(encif, sizeof(encif));
91
92    for (i = 0; i < NENC; i++)
93    {
94	ifp = &encif[i].sc_if;
95	snprintf(ifp->if_xname, sizeof ifp->if_xname, "enc%d", i);
96	ifp->if_softc = &encif[i];
97	ifp->if_mtu = ENCMTU;
98	ifp->if_ioctl = encioctl;
99	ifp->if_output = encoutput;
100	ifp->if_start = encstart;
101	ifp->if_type = IFT_ENC;
102	ifp->if_snd.ifq_maxlen = ifqmaxlen;
103	ifp->if_hdrlen = ENC_HDRLEN;
104	if_attach(ifp);
105	if_alloc_sadl(ifp);
106
107#if NBPFILTER > 0
108	bpfattach(&encif[i].sc_if.if_bpf, ifp, DLT_ENC, ENC_HDRLEN);
109#endif
110    }
111}
112
113/*
114 * Start output on the enc interface.
115 */
116void
117encstart(ifp)
118struct ifnet *ifp;
119{
120    struct mbuf *m;
121    int s;
122
123    for (;;)
124    {
125        s = splnet();
126	IF_DROP(&ifp->if_snd);
127        IF_DEQUEUE(&ifp->if_snd, m);
128        splx(s);
129
130        if (m == NULL)
131          return;
132        else
133          m_freem(m);
134    }
135}
136
137int
138encoutput(ifp, m, dst, rt)
139struct ifnet *ifp;
140register struct mbuf *m;
141struct sockaddr *dst;
142register struct rtentry *rt;
143{
144    m_freem(m);
145    return (0);
146}
147
148/* ARGSUSED */
149int
150encioctl(ifp, cmd, data)
151register struct ifnet *ifp;
152u_long cmd;
153caddr_t data;
154{
155    switch (cmd)
156    {
157	case SIOCSIFADDR:
158	case SIOCAIFADDR:
159	case SIOCSIFDSTADDR:
160	case SIOCSIFFLAGS:
161	    if (ifp->if_flags & IFF_UP)
162	      ifp->if_flags |= IFF_RUNNING;
163	    else
164	      ifp->if_flags &= ~IFF_RUNNING;
165	    break;
166
167	default:
168	    return (EINVAL);
169    }
170
171    return 0;
172}
173