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b688fc87 WJ |
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 | * | |
33 | * @(#)if_loop.c 7.13 (Berkeley) 4/26/91 | |
34 | */ | |
35 | ||
36 | /* | |
37 | * Loopback interface driver for protocol testing and timing. | |
38 | */ | |
39 | ||
40 | #include "param.h" | |
41 | #include "systm.h" | |
42 | #include "mbuf.h" | |
43 | #include "socket.h" | |
44 | #include "errno.h" | |
45 | #include "ioctl.h" | |
46 | ||
47 | #include "../net/if.h" | |
48 | #include "../net/if_types.h" | |
49 | #include "../net/netisr.h" | |
50 | #include "../net/route.h" | |
51 | ||
52 | #include "machine/mtpr.h" | |
53 | ||
54 | #ifdef INET | |
55 | #include "../netinet/in.h" | |
56 | #include "../netinet/in_systm.h" | |
57 | #include "../netinet/in_var.h" | |
58 | #include "../netinet/ip.h" | |
59 | #endif | |
60 | ||
61 | #ifdef NS | |
62 | #include "../netns/ns.h" | |
63 | #include "../netns/ns_if.h" | |
64 | #endif | |
65 | ||
66 | #ifdef ISO | |
67 | #include "../netiso/iso.h" | |
68 | #include "../netiso/iso_var.h" | |
69 | #endif | |
70 | ||
71 | #define LOMTU (1024+512) | |
72 | ||
73 | struct ifnet loif; | |
74 | int looutput(), loioctl(); | |
75 | ||
76 | loattach() | |
77 | { | |
78 | register struct ifnet *ifp = &loif; | |
79 | ||
80 | ifp->if_name = "lo"; | |
81 | ifp->if_mtu = LOMTU; | |
82 | ifp->if_flags = IFF_LOOPBACK; | |
83 | ifp->if_ioctl = loioctl; | |
84 | ifp->if_output = looutput; | |
85 | ifp->if_type = IFT_LOOP; | |
86 | ifp->if_hdrlen = 0; | |
87 | ifp->if_addrlen = 0; | |
88 | if_attach(ifp); | |
89 | } | |
90 | ||
91 | looutput(ifp, m, dst, rt) | |
92 | struct ifnet *ifp; | |
93 | register struct mbuf *m; | |
94 | struct sockaddr *dst; | |
95 | register struct rtentry *rt; | |
96 | { | |
97 | int s, isr; | |
98 | register struct ifqueue *ifq = 0; | |
99 | ||
100 | if ((m->m_flags & M_PKTHDR) == 0) | |
101 | panic("looutput no HDR"); | |
102 | m->m_pkthdr.rcvif = ifp; | |
103 | ||
104 | if (rt && rt->rt_flags & RTF_REJECT) { | |
105 | m_freem(m); | |
106 | return (rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); | |
107 | } | |
108 | ifp->if_opackets++; | |
109 | ifp->if_obytes += m->m_pkthdr.len; | |
110 | switch (dst->sa_family) { | |
111 | ||
112 | #ifdef INET | |
113 | case AF_INET: | |
114 | ifq = &ipintrq; | |
115 | isr = NETISR_IP; | |
116 | break; | |
117 | #endif | |
118 | #ifdef NS | |
119 | case AF_NS: | |
120 | ifq = &nsintrq; | |
121 | isr = NETISR_NS; | |
122 | break; | |
123 | #endif | |
124 | #ifdef ISO | |
125 | case AF_ISO: | |
126 | ifq = &clnlintrq; | |
127 | isr = NETISR_ISO; | |
128 | break; | |
129 | #endif | |
130 | default: | |
131 | printf("lo%d: can't handle af%d\n", ifp->if_unit, | |
132 | dst->sa_family); | |
133 | m_freem(m); | |
134 | return (EAFNOSUPPORT); | |
135 | } | |
136 | s = splimp(); | |
137 | if (IF_QFULL(ifq)) { | |
138 | IF_DROP(ifq); | |
139 | m_freem(m); | |
140 | splx(s); | |
141 | return (ENOBUFS); | |
142 | } | |
143 | IF_ENQUEUE(ifq, m); | |
144 | schednetisr(isr); | |
145 | ifp->if_ipackets++; | |
146 | ifp->if_ibytes += m->m_pkthdr.len; | |
147 | splx(s); | |
148 | return (0); | |
149 | } | |
150 | ||
151 | /* ARGSUSED */ | |
152 | lortrequest(cmd, rt, sa) | |
153 | struct rtentry *rt; | |
154 | struct sockaddr *sa; | |
155 | { | |
156 | if (rt) | |
157 | rt->rt_rmx.rmx_mtu = LOMTU; | |
158 | } | |
159 | ||
160 | /* | |
161 | * Process an ioctl request. | |
162 | */ | |
163 | /* ARGSUSED */ | |
164 | loioctl(ifp, cmd, data) | |
165 | register struct ifnet *ifp; | |
166 | int cmd; | |
167 | caddr_t data; | |
168 | { | |
169 | register struct ifaddr *ifa; | |
170 | int error = 0; | |
171 | ||
172 | switch (cmd) { | |
173 | ||
174 | case SIOCSIFADDR: | |
175 | ifp->if_flags |= IFF_UP; | |
176 | ifa = (struct ifaddr *)data; | |
177 | if (ifa != 0 && ifa->ifa_addr->sa_family == AF_ISO) | |
178 | ifa->ifa_rtrequest = lortrequest; | |
179 | /* | |
180 | * Everything else is done at a higher level. | |
181 | */ | |
182 | break; | |
183 | ||
184 | default: | |
185 | error = EINVAL; | |
186 | } | |
187 | return (error); | |
188 | } |