__P() removal
[dragonfly.git] / sys / net / disc / if_disc.c
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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
34 * $FreeBSD: src/sys/net/if_disc.c,v 1.26.2.2 2001/12/20 10:30:16 ru Exp $
158abb01 35 * $DragonFly: src/sys/net/disc/if_disc.c,v 1.4 2003/08/26 20:49:47 rob Exp $
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36 */
37
38/*
39 * Discard interface driver for protocol testing and timing.
40 * (Based on the loopback.)
41 */
42
43#include <sys/param.h>
44#include <sys/systm.h>
45#include <sys/kernel.h>
46#include <sys/module.h>
47#include <sys/mbuf.h>
48#include <sys/socket.h>
49#include <sys/sockio.h>
50
51#include <net/if.h>
52#include <net/if_types.h>
53#include <net/route.h>
54#include <net/bpf.h>
55
56#include "opt_inet.h"
57#include "opt_inet6.h"
58
59#ifdef TINY_DSMTU
60#define DSMTU (1024+512)
61#else
62#define DSMTU 65532
63#endif
64
158abb01 65static void discattach (void);
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66
67static struct ifnet discif;
68static int discoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
69 struct rtentry *);
70static void discrtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info);
71static int discioctl(struct ifnet *, u_long, caddr_t);
72
73/* ARGSUSED */
74static void
75discattach()
76{
82ed7fc2 77 struct ifnet *ifp = &discif;
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78
79 ifp->if_name = "ds";
80 ifp->if_mtu = DSMTU;
81 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
82 ifp->if_ioctl = discioctl;
83 ifp->if_output = discoutput;
84 ifp->if_type = IFT_LOOP;
85 ifp->if_hdrlen = 0;
86 ifp->if_addrlen = 0;
87 ifp->if_snd.ifq_maxlen = 20;
88 if_attach(ifp);
89 bpfattach(ifp, DLT_NULL, sizeof(u_int));
90}
91
92static int
93disc_modevent(module_t mod, int type, void *data)
94{
95 switch (type) {
96 case MOD_LOAD:
97 discattach();
98 break;
99 case MOD_UNLOAD:
100 printf("if_disc module unload - not possible for this module type\n");
101 return EINVAL;
102 }
103 return 0;
104}
105
106static moduledata_t disc_mod = {
107 "if_disc",
108 disc_modevent,
109 NULL
110};
111
112DECLARE_MODULE(if_disc, disc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
113
114static int
115discoutput(ifp, m, dst, rt)
116 struct ifnet *ifp;
82ed7fc2 117 struct mbuf *m;
984263bc 118 struct sockaddr *dst;
82ed7fc2 119 struct rtentry *rt;
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120{
121 if ((m->m_flags & M_PKTHDR) == 0)
122 panic("discoutput no HDR");
123 /* BPF write needs to be handled specially */
124 if (dst->sa_family == AF_UNSPEC) {
125 dst->sa_family = *(mtod(m, int *));
126 m->m_len -= sizeof(int);
127 m->m_pkthdr.len -= sizeof(int);
128 m->m_data += sizeof(int);
129 }
130
131 if (discif.if_bpf) {
132 /*
133 * We need to prepend the address family as
134 * a four byte field. Cons up a dummy header
135 * to pacify bpf. This is safe because bpf
136 * will only read from the mbuf (i.e., it won't
137 * try to free it or keep a pointer a to it).
138 */
139 struct mbuf m0;
140 u_int af = dst->sa_family;
141
142 m0.m_next = m;
143 m0.m_len = 4;
144 m0.m_data = (char *)&af;
145
146 bpf_mtap(&discif, &m0);
147 }
148 m->m_pkthdr.rcvif = ifp;
149
150 ifp->if_opackets++;
151 ifp->if_obytes += m->m_pkthdr.len;
152
153 m_freem(m);
154 return 0;
155}
156
157/* ARGSUSED */
158static void
159discrtrequest(cmd, rt, info)
160 int cmd;
161 struct rtentry *rt;
162 struct rt_addrinfo *info;
163{
164 if (rt)
165 rt->rt_rmx.rmx_mtu = DSMTU;
166}
167
168/*
169 * Process an ioctl request.
170 */
171/* ARGSUSED */
172static int
173discioctl(ifp, cmd, data)
82ed7fc2 174 struct ifnet *ifp;
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175 u_long cmd;
176 caddr_t data;
177{
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178 struct ifaddr *ifa;
179 struct ifreq *ifr = (struct ifreq *)data;
180 int error = 0;
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181
182 switch (cmd) {
183
184 case SIOCSIFADDR:
185 ifp->if_flags |= IFF_UP;
186 ifa = (struct ifaddr *)data;
187 if (ifa != 0)
188 ifa->ifa_rtrequest = discrtrequest;
189 /*
190 * Everything else is done at a higher level.
191 */
192 break;
193
194 case SIOCADDMULTI:
195 case SIOCDELMULTI:
196 if (ifr == 0) {
197 error = EAFNOSUPPORT; /* XXX */
198 break;
199 }
200 switch (ifr->ifr_addr.sa_family) {
201
202#ifdef INET
203 case AF_INET:
204 break;
205#endif
206#ifdef INET6
207 case AF_INET6:
208 break;
209#endif
210
211 default:
212 error = EAFNOSUPPORT;
213 break;
214 }
215 break;
216
217 case SIOCSIFMTU:
218 ifp->if_mtu = ifr->ifr_mtu;
219 break;
220
221 default:
222 error = EINVAL;
223 }
224 return (error);
225}