| 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 are permitted |
| 6 | * provided that the above copyright notice and this paragraph are |
| 7 | * duplicated in all such forms and that any documentation, |
| 8 | * advertising materials, and other materials related to such |
| 9 | * distribution and use acknowledge that the software was developed |
| 10 | * by the University of California, Berkeley. The name of the |
| 11 | * University may not be used to endorse or promote products derived |
| 12 | * from this software without specific prior written permission. |
| 13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
| 14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
| 15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| 16 | * |
| 17 | * @(#)if_loop.c 7.7 (Berkeley) %G% |
| 18 | */ |
| 19 | |
| 20 | /* |
| 21 | * Loopback interface driver for protocol testing and timing. |
| 22 | */ |
| 23 | |
| 24 | #include "param.h" |
| 25 | #include "systm.h" |
| 26 | #include "mbuf.h" |
| 27 | #include "socket.h" |
| 28 | #include "errno.h" |
| 29 | #include "ioctl.h" |
| 30 | |
| 31 | #include "../net/if.h" |
| 32 | #include "../net/iftypes.h" |
| 33 | #include "../net/netisr.h" |
| 34 | #include "../net/route.h" |
| 35 | |
| 36 | #include "machine/mtpr.h" |
| 37 | |
| 38 | #ifdef INET |
| 39 | #include "../netinet/in.h" |
| 40 | #include "../netinet/in_systm.h" |
| 41 | #include "../netinet/in_var.h" |
| 42 | #include "../netinet/ip.h" |
| 43 | #endif |
| 44 | |
| 45 | #ifdef NS |
| 46 | #include "../netns/ns.h" |
| 47 | #include "../netns/ns_if.h" |
| 48 | #endif |
| 49 | |
| 50 | #ifdef ISO |
| 51 | #include "../netiso/iso.h" |
| 52 | #include "../netiso/iso_var.h" |
| 53 | #endif |
| 54 | |
| 55 | #define LOMTU (1024+512) |
| 56 | |
| 57 | struct ifnet loif; |
| 58 | int looutput(), loioctl(); |
| 59 | |
| 60 | loattach() |
| 61 | { |
| 62 | register struct ifnet *ifp = &loif; |
| 63 | |
| 64 | ifp->if_name = "lo"; |
| 65 | ifp->if_mtu = LOMTU; |
| 66 | ifp->if_flags = IFF_LOOPBACK; |
| 67 | ifp->if_ioctl = loioctl; |
| 68 | ifp->if_output = looutput; |
| 69 | ifp->if_type = IFT_LOOP; |
| 70 | ifp->if_hdrlen = 0; |
| 71 | ifp->if_addrlen = 0; |
| 72 | if_attach(ifp); |
| 73 | } |
| 74 | |
| 75 | struct mbuf *Loop_Sanity; |
| 76 | |
| 77 | looutput(ifp, m, dst) |
| 78 | struct ifnet *ifp; |
| 79 | register struct mbuf *m; |
| 80 | struct sockaddr *dst; |
| 81 | { |
| 82 | int s; |
| 83 | register struct ifqueue *ifq; |
| 84 | |
| 85 | if ((m->m_flags & M_PKTHDR) == 0) |
| 86 | panic("looutput no HDR"); |
| 87 | m->m_pkthdr.rcvif = ifp; |
| 88 | |
| 89 | {struct mbuf *mm; int mlen = 0; |
| 90 | for (mm = m; m; m = m->m_next) /* XXX debugging code -- sklower */ |
| 91 | mlen += m->m_len; |
| 92 | m = mm; |
| 93 | if (mlen != m->m_pkthdr.len) { |
| 94 | if (Loop_Sanity) |
| 95 | m_freem(Loop_Sanity); |
| 96 | Loop_Sanity = m_copy(m, 0, (int)M_COPYALL); |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | s = splimp(); |
| 101 | ifp->if_opackets++; |
| 102 | switch (dst->sa_family) { |
| 103 | |
| 104 | #ifdef INET |
| 105 | case AF_INET: |
| 106 | ifq = &ipintrq; |
| 107 | if (IF_QFULL(ifq)) { |
| 108 | IF_DROP(ifq); |
| 109 | m_freem(m); |
| 110 | splx(s); |
| 111 | return (ENOBUFS); |
| 112 | } |
| 113 | IF_ENQUEUE(ifq, m); |
| 114 | schednetisr(NETISR_IP); |
| 115 | break; |
| 116 | #endif |
| 117 | #ifdef NS |
| 118 | case AF_NS: |
| 119 | ifq = &nsintrq; |
| 120 | if (IF_QFULL(ifq)) { |
| 121 | IF_DROP(ifq); |
| 122 | m_freem(m); |
| 123 | splx(s); |
| 124 | return (ENOBUFS); |
| 125 | } |
| 126 | IF_ENQUEUE(ifq, m); |
| 127 | schednetisr(NETISR_NS); |
| 128 | break; |
| 129 | #endif |
| 130 | #ifdef ISO |
| 131 | case AF_ISO: |
| 132 | ifq = &clnlintrq; |
| 133 | if (IF_QFULL(ifq)) { |
| 134 | IF_DROP(ifq); |
| 135 | m_freem(m); |
| 136 | splx(s); |
| 137 | return (ENOBUFS); |
| 138 | } |
| 139 | IF_ENQUEUE(ifq, m); |
| 140 | schednetisr(NETISR_ISO); |
| 141 | break; |
| 142 | #endif |
| 143 | default: |
| 144 | splx(s); |
| 145 | printf("lo%d: can't handle af%d\n", ifp->if_unit, |
| 146 | dst->sa_family); |
| 147 | m_freem(m); |
| 148 | return (EAFNOSUPPORT); |
| 149 | } |
| 150 | ifp->if_ipackets++; |
| 151 | splx(s); |
| 152 | return (0); |
| 153 | } |
| 154 | |
| 155 | /* |
| 156 | * Process an ioctl request. |
| 157 | */ |
| 158 | /* ARGSUSED */ |
| 159 | loioctl(ifp, cmd, data) |
| 160 | register struct ifnet *ifp; |
| 161 | int cmd; |
| 162 | caddr_t data; |
| 163 | { |
| 164 | int error = 0; |
| 165 | |
| 166 | switch (cmd) { |
| 167 | |
| 168 | case SIOCSIFADDR: |
| 169 | ifp->if_flags |= IFF_UP; |
| 170 | /* |
| 171 | * Everything else is done at a higher level. |
| 172 | */ |
| 173 | break; |
| 174 | |
| 175 | default: |
| 176 | error = EINVAL; |
| 177 | } |
| 178 | return (error); |
| 179 | } |