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Annotation of 42BSD/sys/netimp/raw_imp.c, revision 1.1

1.1     ! root        1: /*     raw_imp.c       6.1     83/07/29        */
        !             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 "../netinet/in.h"
        !            15: #include "../netinet/in_systm.h"
        !            16: #include "../netimp/if_imp.h"
        !            17: 
        !            18: /*
        !            19:  * Raw interface to IMP.
        !            20:  */
        !            21: 
        !            22: /*
        !            23:  * Generate IMP leader and pass packet to impoutput.
        !            24:  * The user must create a skeletal leader in order to
        !            25:  * communicate message type, message subtype, etc.
        !            26:  * We fill in holes where needed and verify parameters
        !            27:  * supplied by user.
        !            28:  */
        !            29: rimp_output(m, so)
        !            30:        register struct mbuf *m;
        !            31:        struct socket *so;
        !            32: {
        !            33:        struct mbuf *n;
        !            34:        int len, error = 0;
        !            35:        register struct imp_leader *ip;
        !            36:        register struct sockaddr_in *sin;
        !            37:        register struct rawcb *rp = sotorawcb(so);
        !            38:        struct ifnet *ifp;
        !            39:        struct control_leader *cp;
        !            40: 
        !            41:        /*
        !            42:         * Verify user has supplied necessary space
        !            43:         * for the leader and check parameters in it.
        !            44:         */
        !            45:        if ((m->m_off > MMAXOFF || m->m_len < sizeof(struct control_leader)) &&
        !            46:            (m = m_pullup(m, sizeof(struct control_leader))) == 0) {
        !            47:                error = EMSGSIZE;       /* XXX */
        !            48:                goto bad;
        !            49:        }
        !            50:        cp = mtod(m, struct control_leader *);
        !            51:        if (cp->dl_mtype == IMPTYPE_DATA)
        !            52:                if (m->m_len < sizeof(struct imp_leader) &&
        !            53:                    (m = m_pullup(m, sizeof(struct imp_leader))) == 0) {
        !            54:                        error = EMSGSIZE;       /* XXX */
        !            55:                        goto bad;
        !            56:                }
        !            57:        ip = mtod(m, struct imp_leader *);
        !            58:        if (ip->il_format != IMP_NFF) {
        !            59:                error = EMSGSIZE;               /* XXX */
        !            60:                goto bad;
        !            61:        }
        !            62: #ifdef notdef
        !            63:        if (ip->il_link != IMPLINK_IP &&
        !            64:            (ip->il_link<IMPLINK_LOWEXPER || ip->il_link>IMPLINK_HIGHEXPER)) {
        !            65:                error = EPERM;
        !            66:                goto bad;
        !            67:        }
        !            68: #endif
        !            69: 
        !            70:        /*
        !            71:         * Fill in IMP leader -- impoutput refrains from rebuilding
        !            72:         * the leader when it sees the protocol family PF_IMPLINK.
        !            73:         * (message size calculated by walking through mbuf's)
        !            74:         */
        !            75:        for (len = 0, n = m; n; n = n->m_next)
        !            76:                len += n->m_len;
        !            77:        ip->il_length = htons((u_short)(len << 3));
        !            78:        sin = (struct sockaddr_in *)&rp->rcb_faddr;
        !            79: #ifdef notdef
        !            80:        ip->il_network = sin->sin_addr.s_net;
        !            81: #else
        !            82:        ip->il_network = 0;
        !            83: #endif
        !            84:        ip->il_host = sin->sin_addr.s_host;
        !            85:        ip->il_imp = sin->sin_addr.s_imp;
        !            86:        /* no routing here */
        !            87:        ifp = if_ifonnetof((int)sin->sin_addr.s_net);
        !            88:        if (ifp)
        !            89:                return (impoutput(ifp, m, (struct sockaddr *)sin));
        !            90:        error = ENETUNREACH;
        !            91: bad:
        !            92:        m_freem(m);
        !            93:        return (error);
        !            94: }

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