| 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 | } |