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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1982, 1986 Regents of the University of California. | |
3 | * 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 | * | |
70c5ff60 | 33 | * from: @(#)if_loop.c 7.13 (Berkeley) 4/26/91 |
3228baa0 | 34 | * $Id: if_loop.c,v 1.5 1993/11/25 01:34:03 wollman Exp $ |
15637ed4 RG |
35 | */ |
36 | ||
37 | /* | |
38 | * Loopback interface driver for protocol testing and timing. | |
39 | */ | |
40 | ||
41 | #include "param.h" | |
42 | #include "systm.h" | |
43 | #include "mbuf.h" | |
44 | #include "socket.h" | |
45 | #include "errno.h" | |
46 | #include "ioctl.h" | |
3228baa0 | 47 | #include "kernel.h" |
15637ed4 RG |
48 | |
49 | #include "../net/if.h" | |
50 | #include "../net/if_types.h" | |
51 | #include "../net/netisr.h" | |
52 | #include "../net/route.h" | |
53 | ||
54 | #include "machine/mtpr.h" | |
55 | ||
56 | #ifdef INET | |
57 | #include "../netinet/in.h" | |
58 | #include "../netinet/in_systm.h" | |
59 | #include "../netinet/in_var.h" | |
60 | #include "../netinet/ip.h" | |
61 | #endif | |
62 | ||
63 | #ifdef NS | |
64 | #include "../netns/ns.h" | |
65 | #include "../netns/ns_if.h" | |
66 | #endif | |
67 | ||
68 | #ifdef ISO | |
69 | #include "../netiso/iso.h" | |
70 | #include "../netiso/iso_var.h" | |
71 | #endif | |
72 | ||
73 | #include "bpfilter.h" | |
74 | #if NBPFILTER > 0 | |
3228baa0 GW |
75 | #include "sys/time.h" |
76 | #include "net/bpf.h" | |
15637ed4 RG |
77 | static caddr_t lo_bpf; |
78 | #endif | |
79 | ||
5f18fc2f | 80 | #ifdef TINY_LOMTU |
15637ed4 | 81 | #define LOMTU (1024+512) |
5f18fc2f GW |
82 | #else /* reasonable MTU */ |
83 | #define LOMTU 65535 /* maximum MTU for IP */ | |
84 | #endif /* reasonable MTU */ | |
15637ed4 RG |
85 | |
86 | struct ifnet loif; | |
3e8c7e28 GW |
87 | int looutput(struct ifnet *, struct mbuf *, struct sockaddr *, struct rtentry *); |
88 | int loioctl(struct ifnet *, int, caddr_t); | |
4c45483e | 89 | void lortrequest(int, struct rtentry *, struct sockaddr *); |
15637ed4 | 90 | |
3e8c7e28 GW |
91 | void |
92 | loattach(void) | |
15637ed4 RG |
93 | { |
94 | register struct ifnet *ifp = &loif; | |
95 | ||
96 | ifp->if_name = "lo"; | |
97 | ifp->if_mtu = LOMTU; | |
98 | ifp->if_flags = IFF_LOOPBACK; | |
99 | ifp->if_ioctl = loioctl; | |
100 | ifp->if_output = looutput; | |
101 | ifp->if_type = IFT_LOOP; | |
102 | ifp->if_hdrlen = 0; | |
103 | ifp->if_addrlen = 0; | |
104 | if_attach(ifp); | |
105 | #if NBPFILTER > 0 | |
106 | bpfattach(&lo_bpf, ifp, DLT_NULL, sizeof(u_int)); | |
107 | #endif | |
108 | } | |
109 | ||
3228baa0 GW |
110 | TEXT_SET(pseudo_set, loattach); |
111 | ||
3e8c7e28 | 112 | int |
15637ed4 RG |
113 | looutput(ifp, m, dst, rt) |
114 | struct ifnet *ifp; | |
115 | register struct mbuf *m; | |
116 | struct sockaddr *dst; | |
117 | register struct rtentry *rt; | |
118 | { | |
119 | int s, isr; | |
120 | register struct ifqueue *ifq = 0; | |
121 | ||
122 | if ((m->m_flags & M_PKTHDR) == 0) | |
123 | panic("looutput no HDR"); | |
124 | #if NBPFILTER > 0 | |
125 | if (lo_bpf) { | |
126 | /* | |
127 | * We need to prepend the address family as | |
128 | * a four byte field. Cons up a dummy header | |
129 | * to pacify bpf. This is safe because bpf | |
130 | * will only read from the mbuf (i.e., it won't | |
131 | * try to free it or keep a pointer to it). | |
132 | */ | |
133 | struct mbuf m0; | |
134 | u_int af = dst->sa_family; | |
135 | ||
136 | m0.m_next = m; | |
137 | m0.m_len = 4; | |
138 | m0.m_data = (char *)⁡ | |
139 | ||
140 | bpf_mtap(lo_bpf, &m0); | |
141 | } | |
142 | #endif | |
143 | m->m_pkthdr.rcvif = ifp; | |
144 | ||
145 | if (rt && rt->rt_flags & RTF_REJECT) { | |
146 | m_freem(m); | |
147 | return (rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); | |
148 | } | |
149 | ifp->if_opackets++; | |
150 | ifp->if_obytes += m->m_pkthdr.len; | |
151 | switch (dst->sa_family) { | |
152 | ||
153 | #ifdef INET | |
154 | case AF_INET: | |
155 | ifq = &ipintrq; | |
156 | isr = NETISR_IP; | |
157 | break; | |
158 | #endif | |
159 | #ifdef NS | |
160 | case AF_NS: | |
161 | ifq = &nsintrq; | |
162 | isr = NETISR_NS; | |
163 | break; | |
164 | #endif | |
165 | #ifdef ISO | |
166 | case AF_ISO: | |
167 | ifq = &clnlintrq; | |
168 | isr = NETISR_ISO; | |
169 | break; | |
170 | #endif | |
171 | default: | |
172 | printf("lo%d: can't handle af%d\n", ifp->if_unit, | |
173 | dst->sa_family); | |
174 | m_freem(m); | |
175 | return (EAFNOSUPPORT); | |
176 | } | |
177 | s = splimp(); | |
178 | if (IF_QFULL(ifq)) { | |
179 | IF_DROP(ifq); | |
180 | m_freem(m); | |
181 | splx(s); | |
182 | return (ENOBUFS); | |
183 | } | |
184 | IF_ENQUEUE(ifq, m); | |
185 | schednetisr(isr); | |
186 | ifp->if_ipackets++; | |
187 | ifp->if_ibytes += m->m_pkthdr.len; | |
188 | splx(s); | |
189 | return (0); | |
190 | } | |
191 | ||
192 | /* ARGSUSED */ | |
4c45483e | 193 | void |
15637ed4 | 194 | lortrequest(cmd, rt, sa) |
4c45483e GW |
195 | int cmd; |
196 | struct rtentry *rt; | |
197 | struct sockaddr *sa; | |
15637ed4 | 198 | { |
3e8c7e28 GW |
199 | if (rt) { |
200 | #ifdef DEBUG | |
201 | printf("lo0: lortrequest: setting route MTU to %u\n", | |
202 | LOMTU); | |
203 | #endif | |
15637ed4 | 204 | rt->rt_rmx.rmx_mtu = LOMTU; |
3e8c7e28 | 205 | } |
15637ed4 RG |
206 | } |
207 | ||
208 | /* | |
209 | * Process an ioctl request. | |
210 | */ | |
211 | /* ARGSUSED */ | |
3e8c7e28 | 212 | int |
15637ed4 RG |
213 | loioctl(ifp, cmd, data) |
214 | register struct ifnet *ifp; | |
215 | int cmd; | |
216 | caddr_t data; | |
217 | { | |
218 | register struct ifaddr *ifa; | |
219 | int error = 0; | |
220 | ||
221 | switch (cmd) { | |
222 | ||
223 | case SIOCSIFADDR: | |
224 | ifp->if_flags |= IFF_UP; | |
225 | ifa = (struct ifaddr *)data; | |
226 | if (ifa != 0 && ifa->ifa_addr->sa_family == AF_ISO) | |
227 | ifa->ifa_rtrequest = lortrequest; | |
228 | /* | |
229 | * Everything else is done at a higher level. | |
230 | */ | |
231 | break; | |
232 | ||
233 | default: | |
234 | error = EINVAL; | |
235 | } | |
236 | return (error); | |
237 | } |