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Annotation of 43BSDTahoe/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 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   7.4 (Berkeley) 6/27/88
        !            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/netisr.h"
        !            33: #include "../net/route.h"
        !            34: 
        !            35: #include "../machine/mtpr.h"
        !            36: 
        !            37: #ifdef INET
        !            38: #include "../netinet/in.h"
        !            39: #include "../netinet/in_systm.h"
        !            40: #include "../netinet/in_var.h"
        !            41: #include "../netinet/ip.h"
        !            42: #endif
        !            43: 
        !            44: #ifdef NS
        !            45: #include "../netns/ns.h"
        !            46: #include "../netns/ns_if.h"
        !            47: #endif
        !            48: 
        !            49: #define        LOMTU   (1024+512)
        !            50: 
        !            51: struct ifnet loif;
        !            52: int    looutput(), loioctl();
        !            53: 
        !            54: loattach()
        !            55: {
        !            56:        register struct ifnet *ifp = &loif;
        !            57: 
        !            58:        ifp->if_name = "lo";
        !            59:        ifp->if_mtu = LOMTU;
        !            60:        ifp->if_flags = IFF_LOOPBACK;
        !            61:        ifp->if_ioctl = loioctl;
        !            62:        ifp->if_output = looutput;
        !            63:        if_attach(ifp);
        !            64: }
        !            65: 
        !            66: looutput(ifp, m0, dst)
        !            67:        struct ifnet *ifp;
        !            68:        register struct mbuf *m0;
        !            69:        struct sockaddr *dst;
        !            70: {
        !            71:        int s;
        !            72:        register struct ifqueue *ifq;
        !            73:        struct mbuf *m;
        !            74: 
        !            75:        /*
        !            76:         * Place interface pointer before the data
        !            77:         * for the receiving protocol.
        !            78:         */
        !            79:        if (m0->m_off <= MMAXOFF &&
        !            80:            m0->m_off >= MMINOFF + sizeof(struct ifnet *)) {
        !            81:                m0->m_off -= sizeof(struct ifnet *);
        !            82:                m0->m_len += sizeof(struct ifnet *);
        !            83:        } else {
        !            84:                MGET(m, M_DONTWAIT, MT_HEADER);
        !            85:                if (m == (struct mbuf *)0)
        !            86:                        return (ENOBUFS);
        !            87:                m->m_off = MMINOFF;
        !            88:                m->m_len = sizeof(struct ifnet *);
        !            89:                m->m_next = m0;
        !            90:                m0 = m;
        !            91:        }
        !            92:        *(mtod(m0, struct ifnet **)) = ifp;
        !            93:        s = splimp();
        !            94:        ifp->if_opackets++;
        !            95:        switch (dst->sa_family) {
        !            96: 
        !            97: #ifdef INET
        !            98:        case AF_INET:
        !            99:                ifq = &ipintrq;
        !           100:                if (IF_QFULL(ifq)) {
        !           101:                        IF_DROP(ifq);
        !           102:                        m_freem(m0);
        !           103:                        splx(s);
        !           104:                        return (ENOBUFS);
        !           105:                }
        !           106:                IF_ENQUEUE(ifq, m0);
        !           107:                schednetisr(NETISR_IP);
        !           108:                break;
        !           109: #endif
        !           110: #ifdef NS
        !           111:        case AF_NS:
        !           112:                ifq = &nsintrq;
        !           113:                if (IF_QFULL(ifq)) {
        !           114:                        IF_DROP(ifq);
        !           115:                        m_freem(m0);
        !           116:                        splx(s);
        !           117:                        return (ENOBUFS);
        !           118:                }
        !           119:                IF_ENQUEUE(ifq, m0);
        !           120:                schednetisr(NETISR_NS);
        !           121:                break;
        !           122: #endif
        !           123:        default:
        !           124:                splx(s);
        !           125:                printf("lo%d: can't handle af%d\n", ifp->if_unit,
        !           126:                        dst->sa_family);
        !           127:                m_freem(m0);
        !           128:                return (EAFNOSUPPORT);
        !           129:        }
        !           130:        ifp->if_ipackets++;
        !           131:        splx(s);
        !           132:        return (0);
        !           133: }
        !           134: 
        !           135: /*
        !           136:  * Process an ioctl request.
        !           137:  */
        !           138: /* ARGSUSED */
        !           139: loioctl(ifp, cmd, data)
        !           140:        register struct ifnet *ifp;
        !           141:        int cmd;
        !           142:        caddr_t data;
        !           143: {
        !           144:        int error = 0;
        !           145: 
        !           146:        switch (cmd) {
        !           147: 
        !           148:        case SIOCSIFADDR:
        !           149:                ifp->if_flags |= IFF_UP;
        !           150:                /*
        !           151:                 * Everything else is done at a higher level.
        !           152:                 */
        !           153:                break;
        !           154: 
        !           155:        default:
        !           156:                error = EINVAL;
        !           157:        }
        !           158:        return (error);
        !           159: }

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