1/*
2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * From: @(#)if_loop.c 8.1 (Berkeley) 6/10/93
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34 * $FreeBSD: head/sys/net/if_disc.c 78351 2001-06-16 10:47:34Z markm $
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| 34 * $FreeBSD: head/sys/net/if_disc.c 85074 2001-10-17 18:07:05Z ru $ |
35 */
36
37/*
38 * Discard interface driver for protocol testing and timing.
39 * (Based on the loopback.)
40 */
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/kernel.h>
45#include <sys/module.h>
46#include <sys/mbuf.h>
47#include <sys/socket.h>
48#include <sys/sockio.h>
49
50#include <net/if.h>
51#include <net/if_types.h>
52#include <net/route.h>
53#include <net/bpf.h>
54
55#include "opt_inet.h"
56#include "opt_inet6.h"
57
58#ifdef TINY_DSMTU
59#define DSMTU (1024+512)
60#else
61#define DSMTU 65532
62#endif
63
64static void discattach(void);
65
66static struct ifnet discif;
67static int discoutput(struct ifnet *, struct mbuf *,
68 struct sockaddr *, struct rtentry *);
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69static void discrtrequest(int, struct rtentry *, struct sockaddr *);
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| 69static void discrtrequest(int, struct rtentry *, struct rt_addrinfo *); |
70static int discioctl(struct ifnet *, u_long, caddr_t);
71
72static void
73discattach(void)
74{
75 struct ifnet *ifp = &discif;
76
77 ifp->if_name = "ds";
78 ifp->if_mtu = DSMTU;
79 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
80 ifp->if_ioctl = discioctl;
81 ifp->if_output = discoutput;
82 ifp->if_type = IFT_LOOP;
83 ifp->if_hdrlen = 0;
84 ifp->if_addrlen = 0;
85 ifp->if_snd.ifq_maxlen = 20;
86 if_attach(ifp);
87 bpfattach(ifp, DLT_NULL, sizeof(u_int));
88}
89
90static int
91disc_modevent(module_t mod, int type, void *data)
92{
93 switch (type) {
94 case MOD_LOAD:
95 discattach();
96 break;
97 case MOD_UNLOAD:
98 printf("if_disc module unload - not possible for this module type\n");
99 return EINVAL;
100 }
101 return 0;
102}
103
104static moduledata_t disc_mod = {
105 "if_disc",
106 disc_modevent,
107 NULL
108};
109
110DECLARE_MODULE(if_disc, disc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
111
112static int
113discoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
114 struct rtentry *rt)
115{
116 if ((m->m_flags & M_PKTHDR) == 0)
117 panic("discoutput no HDR");
118 /* BPF write needs to be handled specially */
119 if (dst->sa_family == AF_UNSPEC) {
120 dst->sa_family = *(mtod(m, int *));
121 m->m_len -= sizeof(int);
122 m->m_pkthdr.len -= sizeof(int);
123 m->m_data += sizeof(int);
124 }
125
126 if (discif.if_bpf) {
127 /*
128 * We need to prepend the address family as
129 * a four byte field. Cons up a dummy header
130 * to pacify bpf. This is safe because bpf
131 * will only read from the mbuf (i.e., it won't
132 * try to free it or keep a pointer a to it).
133 */
134 struct mbuf m0;
135 u_int af = dst->sa_family;
136
137 m0.m_next = m;
138 m0.m_len = 4;
139 m0.m_data = (char *)⁡
140
141 bpf_mtap(&discif, &m0);
142 }
143 m->m_pkthdr.rcvif = ifp;
144
145 ifp->if_opackets++;
146 ifp->if_obytes += m->m_pkthdr.len;
147
148 m_freem(m);
149 return 0;
150}
151
152/* ARGSUSED */
153static void
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154discrtrequest(int cmd, struct rtentry *rt, struct sockaddr *sa)
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| 154discrtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) |
155{
156 if (rt)
157 rt->rt_rmx.rmx_mtu = DSMTU;
158}
159
160/*
161 * Process an ioctl request.
162 */
163static int
164discioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
165{
166 struct ifaddr *ifa;
167 struct ifreq *ifr = (struct ifreq *)data;
168 int error = 0;
169
170 switch (cmd) {
171
172 case SIOCSIFADDR:
173 ifp->if_flags |= IFF_UP;
174 ifa = (struct ifaddr *)data;
175 if (ifa != 0)
176 ifa->ifa_rtrequest = discrtrequest;
177 /*
178 * Everything else is done at a higher level.
179 */
180 break;
181
182 case SIOCADDMULTI:
183 case SIOCDELMULTI:
184 if (ifr == 0) {
185 error = EAFNOSUPPORT; /* XXX */
186 break;
187 }
188 switch (ifr->ifr_addr.sa_family) {
189
190#ifdef INET
191 case AF_INET:
192 break;
193#endif
194#ifdef INET6
195 case AF_INET6:
196 break;
197#endif
198
199 default:
200 error = EAFNOSUPPORT;
201 break;
202 }
203 break;
204
205 case SIOCSIFMTU:
206 ifp->if_mtu = ifr->ifr_mtu;
207 break;
208
209 default:
210 error = EINVAL;
211 }
212 return error;
213}
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