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Annotation of Net2/net/if_loop.c, revision 1.1

1.1     ! root        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: }

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