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Annotation of Net2/netimp/raw_imp.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986, 1988 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:  *     @(#)raw_imp.c   7.6 (Berkeley) 6/28/90
        !            34:  */
        !            35: 
        !            36: #include "param.h"
        !            37: #include "mbuf.h"
        !            38: #include "socket.h"
        !            39: #include "protosw.h"
        !            40: #include "socketvar.h"
        !            41: #include "errno.h"
        !            42: 
        !            43: #include "../net/if.h"
        !            44: #include "../net/route.h"
        !            45: #include "../net/raw_cb.h"
        !            46: 
        !            47: #include "../netinet/in.h"
        !            48: #include "../netinet/in_systm.h"
        !            49: #include "../netinet/in_var.h"
        !            50: #include "../netinet/in_pcb.h"
        !            51: #include "if_imp.h"
        !            52: 
        !            53: /*
        !            54:  * Raw interface to IMP.
        !            55:  */
        !            56: 
        !            57: /*
        !            58:  * Generate IMP leader and pass packet to impoutput.
        !            59:  * The user must create a skeletal leader in order to
        !            60:  * communicate message type, message subtype, etc.
        !            61:  * We fill in holes where needed and verify parameters
        !            62:  * supplied by user.
        !            63:  */
        !            64: rimp_output(m, so)
        !            65:        register struct mbuf *m;
        !            66:        struct socket *so;
        !            67: {
        !            68:        struct mbuf *n;
        !            69:        int len, error = 0;
        !            70:        register struct imp_leader *ip;
        !            71:        register struct sockaddr_in *sin;
        !            72:        register struct raw_inpcb *rp = sotorawinpcb(so);
        !            73:        struct in_ifaddr *ia;
        !            74:        struct control_leader *cp;
        !            75: 
        !            76:        /*
        !            77:         * Verify user has supplied necessary space
        !            78:         * for the leader and check parameters in it.
        !            79:         */
        !            80:        if ((m->m_len < sizeof(struct control_leader)) &&
        !            81:            (m = m_pullup(m, sizeof(struct control_leader))) == 0) {
        !            82:                error = EMSGSIZE;       /* XXX */
        !            83:                goto bad;
        !            84:        }
        !            85:        cp = mtod(m, struct control_leader *);
        !            86:        if (cp->dl_mtype == IMPTYPE_DATA)
        !            87:                if (m->m_len < sizeof(struct imp_leader) &&
        !            88:                    (m = m_pullup(m, sizeof(struct imp_leader))) == 0) {
        !            89:                        error = EMSGSIZE;       /* XXX */
        !            90:                        goto bad;
        !            91:                }
        !            92:        ip = mtod(m, struct imp_leader *);
        !            93:        if (ip->il_format != IMP_NFF) {
        !            94:                error = EMSGSIZE;               /* XXX */
        !            95:                goto bad;
        !            96:        }
        !            97: #ifdef notdef
        !            98:        if (ip->il_link != IMPLINK_IP &&
        !            99:            (ip->il_link<IMPLINK_LOWEXPER || ip->il_link>IMPLINK_HIGHEXPER)) {
        !           100:                error = EPERM;
        !           101:                goto bad;
        !           102:        }
        !           103: #endif
        !           104: 
        !           105:        /*
        !           106:         * Fill in IMP leader -- impoutput refrains from rebuilding
        !           107:         * the leader when it sees the protocol family PF_IMPLINK.
        !           108:         * (message size calculated by walking through mbuf's)
        !           109:         */
        !           110:        for (len = 0, n = m; n; n = n->m_next)
        !           111:                len += n->m_len;
        !           112:        ip->il_length = htons((u_short)(len << 3));
        !           113:        sin = (struct sockaddr_in *)rp->rinp_rcb.rcb_faddr;
        !           114:        imp_addr_to_leader((struct control_leader *)ip, sin->sin_addr.s_addr);
        !           115:        /* no routing here */
        !           116:        ia = in_iaonnetof(in_netof(sin->sin_addr));
        !           117:        if (ia)
        !           118:                return (impoutput(ia->ia_ifp, m, (struct sockaddr *)sin));
        !           119:        error = ENETUNREACH;
        !           120: bad:
        !           121:        m_freem(m);
        !           122:        return (error);
        !           123: }

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