if_enc.c revision 1.47 
1/*	$OpenBSD: if_enc.c,v 1.47 2007/12/20 02:53:02 brad 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
82void
83encattach(int nenc)
84{
85	struct ifnet *ifp;
86	int i;
87
88	bzero(encif, sizeof(encif));
89
90	for (i = 0; i < NENC; i++) {
91		ifp = &encif[i].sc_if;
92		snprintf(ifp->if_xname, sizeof ifp->if_xname, "enc%d", i);
93		ifp->if_softc = &encif[i];
94		ifp->if_mtu = ENCMTU;
95		ifp->if_ioctl = encioctl;
96		ifp->if_output = encoutput;
97		ifp->if_start = encstart;
98		ifp->if_type = IFT_ENC;
99		ifp->if_snd.ifq_maxlen = ifqmaxlen;
100		ifp->if_hdrlen = ENC_HDRLEN;
101		if_attach(ifp);
102		if_alloc_sadl(ifp);
103
104#if NBPFILTER > 0
105		bpfattach(&encif[i].sc_if.if_bpf, ifp, DLT_ENC, ENC_HDRLEN);
106#endif
107	}
108}
109
110/*
111 * Start output on the enc interface.
112 */
113void
114encstart(struct ifnet *ifp)
115{
116	struct mbuf *m;
117	int s;
118
119	for (;;) {
120		s = splnet();
121		IF_DROP(&ifp->if_snd);
122		IF_DEQUEUE(&ifp->if_snd, m);
123		splx(s);
124
125		if (m == NULL)
126			return;
127		else
128			m_freem(m);
129	}
130}
131
132int
133encoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
134    struct rtentry *rt)
135{
136	m_freem(m);
137	return (0);
138}
139
140/* ARGSUSED */
141int
142encioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
143{
144	switch (cmd) {
145	case SIOCSIFADDR:
146	case SIOCAIFADDR:
147	case SIOCSIFDSTADDR:
148	case SIOCSIFFLAGS:
149		if (ifp->if_flags & IFF_UP)
150			ifp->if_flags |= IFF_RUNNING;
151		else
152			ifp->if_flags &= ~IFF_RUNNING;
153		break;
154	default:
155		return (ENOTTY);
156	}
157
158	return 0;
159}
160