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Annotation of 42BSD/sys/netpup/raw_ether.c, revision 1.1

1.1     ! root        1: /*     %M%     %I%     %E%     */
        !             2: 
        !             3: #include "../h/param.h"
        !             4: #include "../h/mbuf.h"
        !             5: #include "../h/socket.h"
        !             6: #include "../h/protosw.h"
        !             7: #include "../h/socketvar.h"
        !             8: #include "../h/errno.h"
        !             9: 
        !            10: #include "../net/if.h"
        !            11: #include "../net/route.h"
        !            12: #include "../net/raw_cb.h"
        !            13: 
        !            14: #include "../netpup/ether.h"
        !            15: #include "../vaxif/if_en.h"
        !            16: 
        !            17: /*
        !            18:  * Raw interface to 3Mb/s Ethernet.
        !            19:  */
        !            20: 
        !            21: struct sockaddr etherlink = { AF_ETHERLINK };
        !            22: /*
        !            23:  * Generate Ethernet header and pass packet to output
        !            24:  * routine.  The user must create a skeletal header
        !            25:  * in order to message type.  Source and destination
        !            26:  * field are filled in from send parameters.
        !            27:  */
        !            28: raw_enoutput(m, so)
        !            29:        register struct mbuf *m;
        !            30:        struct socket *so;
        !            31: {
        !            32:        register struct en_header *en;
        !            33:        register struct sockaddr_en *sen;
        !            34:        register struct rawcb *rp = sotorawcb(so);
        !            35:        struct ifnet *ifp;
        !            36:        int error = 0;
        !            37: 
        !            38:        /*
        !            39:         * Verify user has supplied necessary space for the header.
        !            40:         */
        !            41:        if ((m->m_off > MMAXOFF || m->m_len < sizeof (struct en_header)) &&
        !            42:            (m = m_pullup(m, sizeof (struct en_header))) == 0) {
        !            43:                error = EMSGSIZE;       /* XXX */
        !            44:                goto bad;
        !            45:        }
        !            46:        en = mtod(m, struct en_header *);
        !            47:        sen = (struct sockaddr_en *)&rp->rcb_faddr;
        !            48:        en->en_dhost = sen->sen_host;
        !            49:        if (rp->rcb_route.ro_rt == 0)
        !            50:                ifp = if_ifonnetof(sen->sen_net);
        !            51:        else {
        !            52:                rp->rcb_route.ro_rt->rt_use++;
        !            53:                ifp = rp->rcb_route.ro_rt->rt_ifp;
        !            54:        }
        !            55:        if (ifp == 0) {
        !            56:                error = ENETUNREACH;
        !            57:                goto bad;
        !            58:        }
        !            59:        en->en_shost = ifp->if_host[0];
        !            60:        return ((*ifp->if_output)(ifp, m, &etherlink));
        !            61: bad:
        !            62:        m_freem(m);
        !            63:        return (error);
        !            64: }

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