if_enc.c revision 1.41 
1/*	$OpenBSD: if_enc.c,v 1.41 2004/09/15 17:46:44 grange 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 NS
66extern struct ifqueue nsintrq;
67#endif
68
69#include "bpfilter.h"
70#include "enc.h"
71
72#ifdef ENCDEBUG
73#define DPRINTF(x)    do { if (encdebug) printf x ; } while (0)
74#else
75#define DPRINTF(x)
76#endif
77
78struct enc_softc encif[NENC];
79
80void	encattach(int);
81int	encoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
82	    	       struct rtentry *);
83int	encioctl(struct ifnet *, u_long, caddr_t);
84void	encrtrequest(int, struct rtentry *, struct sockaddr *);
85void	encstart(struct ifnet *);
86
87extern int ifqmaxlen;
88
89void
90encattach(int nenc)
91{
92    struct ifnet *ifp;
93    int i;
94
95    bzero(encif, sizeof(encif));
96
97    for (i = 0; i < NENC; i++)
98    {
99	ifp = &encif[i].sc_if;
100	snprintf(ifp->if_xname, sizeof ifp->if_xname, "enc%d", i);
101	ifp->if_softc = &encif[i];
102	ifp->if_mtu = ENCMTU;
103	ifp->if_ioctl = encioctl;
104	ifp->if_output = encoutput;
105	ifp->if_start = encstart;
106	ifp->if_type = IFT_ENC;
107	ifp->if_snd.ifq_maxlen = ifqmaxlen;
108	ifp->if_hdrlen = ENC_HDRLEN;
109	if_attach(ifp);
110	if_alloc_sadl(ifp);
111
112#if NBPFILTER > 0
113	bpfattach(&encif[i].sc_if.if_bpf, ifp, DLT_ENC, ENC_HDRLEN);
114#endif
115    }
116}
117
118/*
119 * Start output on the enc interface.
120 */
121void
122encstart(ifp)
123struct ifnet *ifp;
124{
125    struct mbuf *m;
126    int s;
127
128    for (;;)
129    {
130        s = splimp();
131	IF_DROP(&ifp->if_snd);
132        IF_DEQUEUE(&ifp->if_snd, m);
133        splx(s);
134
135        if (m == NULL)
136          return;
137        else
138          m_freem(m);
139    }
140}
141
142int
143encoutput(ifp, m, dst, rt)
144struct ifnet *ifp;
145register struct mbuf *m;
146struct sockaddr *dst;
147register struct rtentry *rt;
148{
149    m_freem(m);
150    return (0);
151}
152
153/* ARGSUSED */
154void
155encrtrequest(cmd, rt, sa)
156int cmd;
157struct rtentry *rt;
158struct sockaddr *sa;
159{
160    if (rt)
161      rt->rt_rmx.rmx_mtu = ENCMTU;
162}
163
164/* ARGSUSED */
165int
166encioctl(ifp, cmd, data)
167register struct ifnet *ifp;
168u_long cmd;
169caddr_t data;
170{
171    switch (cmd)
172    {
173	case SIOCSIFADDR:
174	case SIOCAIFADDR:
175	case SIOCSIFDSTADDR:
176	case SIOCSIFFLAGS:
177	    if (ifp->if_flags & IFF_UP)
178	      ifp->if_flags |= IFF_RUNNING;
179	    else
180	      ifp->if_flags &= ~IFF_RUNNING;
181	    break;
182
183	default:
184	    return (EINVAL);
185    }
186
187    return 0;
188}
189