if_enc.c revision 1.32 
1/*	$OpenBSD: if_enc.c,v 1.32 2000/12/30 22:56:23 angelos Exp $	*/
2
3/*
4 * The authors of this code are John Ioannidis (ji@tla.org),
5 * Angelos D. Keromytis (kermit@csd.uch.gr) and
6 * Niels Provos (provos@physnet.uni-hamburg.de).
7 *
8 * This code was written by John Ioannidis for BSD/OS in Athens, Greece,
9 * in November 1995.
10 *
11 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
12 * by Angelos D. Keromytis.
13 *
14 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
15 * and Niels Provos.
16 *
17 * Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis
18 * and Niels Provos.
19 *
20 * Permission to use, copy, and modify this software 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/kernel.h>
43#include <sys/mbuf.h>
44#include <sys/socket.h>
45#include <sys/errno.h>
46#include <sys/ioctl.h>
47#include <sys/proc.h>
48
49#include <machine/cpu.h>
50
51#include <net/if.h>
52#include <net/if_types.h>
53#include <net/netisr.h>
54#include <net/route.h>
55#include <net/bpf.h>
56
57#include <netinet/ip_ipsp.h>
58#include <net/if_enc.h>
59
60#ifdef	INET
61#include <netinet/in.h>
62#include <netinet/in_systm.h>
63#include <netinet/in_var.h>
64#include <netinet/ip_var.h>
65#include <netinet/ip.h>
66#endif
67
68#ifdef INET6
69#ifndef INET
70#include <netinet/in.h>
71#endif
72#include <netinet/ip6.h>
73#include <netinet6/ip6_var.h>
74#include <netinet6/nd6.h>
75#endif /* INET6 */
76
77#ifdef ISO
78extern struct ifqueue clnlintrq;
79#endif
80
81#ifdef NS
82extern struct ifqueue nsintrq;
83#endif
84
85#include "bpfilter.h"
86#include "enc.h"
87
88#ifdef ENCDEBUG
89#define DPRINTF(x)    do { if (encdebug) printf x ; } while (0)
90#else
91#define DPRINTF(x)
92#endif
93
94#ifndef offsetof
95#define offsetof(s, e) ((int)&((s *)0)->e)
96#endif
97
98struct enc_softc encif[NENC];
99
100void	encattach __P((int));
101int	encoutput __P((struct ifnet *, struct mbuf *, struct sockaddr *,
102	    	       struct rtentry *));
103int	encioctl __P((struct ifnet *, u_long, caddr_t));
104void	encrtrequest __P((int, struct rtentry *, struct sockaddr *));
105void	encstart __P((struct ifnet *));
106
107extern int ifqmaxlen;
108
109void
110encattach(int nenc)
111{
112    struct ifnet *ifp;
113    int i;
114
115    bzero(encif, sizeof(encif));
116
117    for (i = 0; i < NENC; i++)
118    {
119	ifp = &encif[i].sc_if;
120	sprintf(ifp->if_xname, "enc%d", i);
121	ifp->if_softc = &encif[i];
122	ifp->if_mtu = ENCMTU;
123	ifp->if_ioctl = encioctl;
124	ifp->if_output = encoutput;
125	ifp->if_start = encstart;
126	ifp->if_type = IFT_ENC;
127	ifp->if_snd.ifq_maxlen = ifqmaxlen;
128	ifp->if_hdrlen = ENC_HDRLEN;
129	if_attach(ifp);
130
131#if NBPFILTER > 0
132	bpfattach(&encif[i].sc_if.if_bpf, ifp, DLT_ENC, ENC_HDRLEN);
133#endif
134#ifdef INET6
135	nd6_ifattach(ifp);
136#endif
137    }
138}
139
140/*
141 * Start output on the enc interface.
142 */
143void
144encstart(ifp)
145struct ifnet *ifp;
146{
147    struct mbuf *m;
148    int s;
149
150    for (;;)
151    {
152        s = splimp();
153	IF_DROP(&ifp->if_snd);
154        IF_DEQUEUE(&ifp->if_snd, m);
155        splx(s);
156
157        if (m == NULL)
158          return;
159        else
160          m_freem(m);
161    }
162}
163
164int
165encoutput(ifp, m, dst, rt)
166struct ifnet *ifp;
167register struct mbuf *m;
168struct sockaddr *dst;
169register struct rtentry *rt;
170{
171    m_freem(m);
172    return 0;
173}
174
175/* ARGSUSED */
176void
177encrtrequest(cmd, rt, sa)
178int cmd;
179struct rtentry *rt;
180struct sockaddr *sa;
181{
182    if (rt)
183      rt->rt_rmx.rmx_mtu = ENCMTU;
184}
185
186/* ARGSUSED */
187int
188encioctl(ifp, cmd, data)
189register struct ifnet *ifp;
190u_long cmd;
191caddr_t data;
192{
193    switch (cmd)
194    {
195	case SIOCSIFADDR:
196	case SIOCAIFADDR:
197	case SIOCSIFDSTADDR:
198	case SIOCSIFFLAGS:
199	    if (ifp->if_flags & IFF_UP)
200	      ifp->if_flags |= IFF_RUNNING;
201	    else
202	      ifp->if_flags &= ~IFF_RUNNING;
203	    break;
204
205	default:
206	    return EINVAL;
207    }
208
209    return 0;
210}
211