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Annotation of 43BSDReno/sys/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 is only permitted until one year after the first shipment
        !             6:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !             7:  * binary forms are permitted provided that: (1) source distributions retain
        !             8:  * this entire copyright notice and comment, and (2) distributions including
        !             9:  * binaries display the following acknowledgement:  This product includes
        !            10:  * software developed by the University of California, Berkeley and its
        !            11:  * contributors'' in the documentation or other materials provided with the
        !            12:  * distribution and in all advertising materials mentioning features or use
        !            13:  * of this software.  Neither the name of the University nor the names of
        !            14:  * its contributors may be used to endorse or promote products derived from
        !            15:  * this software without specific prior written permission.
        !            16:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            19:  *
        !            20:  *     @(#)if_loop.c   7.10 (Berkeley) 6/28/90
        !            21:  */
        !            22: 
        !            23: /*
        !            24:  * Loopback interface driver for protocol testing and timing.
        !            25:  */
        !            26: 
        !            27: #include "param.h"
        !            28: #include "systm.h"
        !            29: #include "mbuf.h"
        !            30: #include "socket.h"
        !            31: #include "errno.h"
        !            32: #include "ioctl.h"
        !            33: 
        !            34: #include "../net/if.h"
        !            35: #include "../net/if_types.h"
        !            36: #include "../net/netisr.h"
        !            37: #include "../net/route.h"
        !            38: 
        !            39: #include "machine/mtpr.h"
        !            40: 
        !            41: #ifdef INET
        !            42: #include "../netinet/in.h"
        !            43: #include "../netinet/in_systm.h"
        !            44: #include "../netinet/in_var.h"
        !            45: #include "../netinet/ip.h"
        !            46: #endif
        !            47: 
        !            48: #ifdef NS
        !            49: #include "../netns/ns.h"
        !            50: #include "../netns/ns_if.h"
        !            51: #endif
        !            52: 
        !            53: #ifdef ISO
        !            54: #include "../netiso/iso.h"
        !            55: #include "../netiso/iso_var.h"
        !            56: #endif
        !            57: 
        !            58: #define        LOMTU   (1024+512)
        !            59: 
        !            60: struct ifnet loif;
        !            61: int    looutput(), loioctl();
        !            62: 
        !            63: loattach()
        !            64: {
        !            65:        register struct ifnet *ifp = &loif;
        !            66: 
        !            67:        ifp->if_name = "lo";
        !            68:        ifp->if_mtu = LOMTU;
        !            69:        ifp->if_flags = IFF_LOOPBACK;
        !            70:        ifp->if_ioctl = loioctl;
        !            71:        ifp->if_output = looutput;
        !            72:        ifp->if_type = IFT_LOOP;
        !            73:        ifp->if_hdrlen = 0;
        !            74:        ifp->if_addrlen = 0;
        !            75:        if_attach(ifp);
        !            76: }
        !            77: 
        !            78: struct mbuf *Loop_Sanity;
        !            79: 
        !            80: looutput(ifp, m, dst)
        !            81:        struct ifnet *ifp;
        !            82:        register struct mbuf *m;
        !            83:        struct sockaddr *dst;
        !            84: {
        !            85:        int s;
        !            86:        register struct ifqueue *ifq;
        !            87: 
        !            88:        if ((m->m_flags & M_PKTHDR) == 0)
        !            89:                panic("looutput no HDR");
        !            90:        m->m_pkthdr.rcvif = ifp;
        !            91: 
        !            92: {struct mbuf *mm; int mlen = 0;
        !            93: for (mm = m; m; m = m->m_next) /* XXX debugging code -- sklower */
        !            94:     mlen += m->m_len;
        !            95: m = mm;
        !            96: if (mlen != m->m_pkthdr.len) {
        !            97:        if (Loop_Sanity)
        !            98:                m_freem(Loop_Sanity);
        !            99:        Loop_Sanity = m_copy(m, 0, (int)M_COPYALL);
        !           100: }
        !           101: }
        !           102: 
        !           103:        s = splimp();
        !           104:        ifp->if_opackets++;
        !           105:        ifp->if_obytes += m->m_pkthdr.len;
        !           106:        switch (dst->sa_family) {
        !           107: 
        !           108: #ifdef INET
        !           109:        case AF_INET:
        !           110:                ifq = &ipintrq;
        !           111:                if (IF_QFULL(ifq)) {
        !           112:                        IF_DROP(ifq);
        !           113:                        m_freem(m);
        !           114:                        splx(s);
        !           115:                        return (ENOBUFS);
        !           116:                }
        !           117:                IF_ENQUEUE(ifq, m);
        !           118:                schednetisr(NETISR_IP);
        !           119:                break;
        !           120: #endif
        !           121: #ifdef NS
        !           122:        case AF_NS:
        !           123:                ifq = &nsintrq;
        !           124:                if (IF_QFULL(ifq)) {
        !           125:                        IF_DROP(ifq);
        !           126:                        m_freem(m);
        !           127:                        splx(s);
        !           128:                        return (ENOBUFS);
        !           129:                }
        !           130:                IF_ENQUEUE(ifq, m);
        !           131:                schednetisr(NETISR_NS);
        !           132:                break;
        !           133: #endif
        !           134: #ifdef ISO
        !           135:        case AF_ISO:
        !           136:                ifq = &clnlintrq;
        !           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(NETISR_ISO);
        !           145:                break;
        !           146: #endif
        !           147:        default:
        !           148:                splx(s);
        !           149:                printf("lo%d: can't handle af%d\n", ifp->if_unit,
        !           150:                        dst->sa_family);
        !           151:                m_freem(m);
        !           152:                return (EAFNOSUPPORT);
        !           153:        }
        !           154:        ifp->if_ipackets++;
        !           155:        ifp->if_ibytes += m->m_pkthdr.len;
        !           156:        splx(s);
        !           157:        return (0);
        !           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:        int error = 0;
        !           170: 
        !           171:        switch (cmd) {
        !           172: 
        !           173:        case SIOCSIFADDR:
        !           174:                ifp->if_flags |= IFF_UP;
        !           175:                /*
        !           176:                 * Everything else is done at a higher level.
        !           177:                 */
        !           178:                break;
        !           179: 
        !           180:        default:
        !           181:                error = EINVAL;
        !           182:        }
        !           183:        return (error);
        !           184: }

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