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Annotation of 43BSDTahoe/sys/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 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:  *     @(#)raw_imp.c   7.4 (Berkeley) 6/29/88
        !            18:  */
        !            19: 
        !            20: #include "param.h"
        !            21: #include "mbuf.h"
        !            22: #include "socket.h"
        !            23: #include "protosw.h"
        !            24: #include "socketvar.h"
        !            25: #include "errno.h"
        !            26: 
        !            27: #include "../net/if.h"
        !            28: #include "../net/route.h"
        !            29: #include "../net/raw_cb.h"
        !            30: 
        !            31: #include "../netinet/in.h"
        !            32: #include "../netinet/in_systm.h"
        !            33: #include "../netinet/in_var.h"
        !            34: #include "if_imp.h"
        !            35: 
        !            36: /*
        !            37:  * Raw interface to IMP.
        !            38:  */
        !            39: 
        !            40: /*
        !            41:  * Generate IMP leader and pass packet to impoutput.
        !            42:  * The user must create a skeletal leader in order to
        !            43:  * communicate message type, message subtype, etc.
        !            44:  * We fill in holes where needed and verify parameters
        !            45:  * supplied by user.
        !            46:  */
        !            47: rimp_output(m, so)
        !            48:        register struct mbuf *m;
        !            49:        struct socket *so;
        !            50: {
        !            51:        struct mbuf *n;
        !            52:        int len, error = 0;
        !            53:        register struct imp_leader *ip;
        !            54:        register struct sockaddr_in *sin;
        !            55:        register struct rawcb *rp = sotorawcb(so);
        !            56:        struct in_ifaddr *ia;
        !            57:        struct control_leader *cp;
        !            58: 
        !            59:        /*
        !            60:         * Verify user has supplied necessary space
        !            61:         * for the leader and check parameters in it.
        !            62:         */
        !            63:        if ((m->m_off > MMAXOFF || m->m_len < sizeof(struct control_leader)) &&
        !            64:            (m = m_pullup(m, sizeof(struct control_leader))) == 0) {
        !            65:                error = EMSGSIZE;       /* XXX */
        !            66:                goto bad;
        !            67:        }
        !            68:        cp = mtod(m, struct control_leader *);
        !            69:        if (cp->dl_mtype == IMPTYPE_DATA)
        !            70:                if (m->m_len < sizeof(struct imp_leader) &&
        !            71:                    (m = m_pullup(m, sizeof(struct imp_leader))) == 0) {
        !            72:                        error = EMSGSIZE;       /* XXX */
        !            73:                        goto bad;
        !            74:                }
        !            75:        ip = mtod(m, struct imp_leader *);
        !            76:        if (ip->il_format != IMP_NFF) {
        !            77:                error = EMSGSIZE;               /* XXX */
        !            78:                goto bad;
        !            79:        }
        !            80: #ifdef notdef
        !            81:        if (ip->il_link != IMPLINK_IP &&
        !            82:            (ip->il_link<IMPLINK_LOWEXPER || ip->il_link>IMPLINK_HIGHEXPER)) {
        !            83:                error = EPERM;
        !            84:                goto bad;
        !            85:        }
        !            86: #endif
        !            87: 
        !            88:        /*
        !            89:         * Fill in IMP leader -- impoutput refrains from rebuilding
        !            90:         * the leader when it sees the protocol family PF_IMPLINK.
        !            91:         * (message size calculated by walking through mbuf's)
        !            92:         */
        !            93:        for (len = 0, n = m; n; n = n->m_next)
        !            94:                len += n->m_len;
        !            95:        ip->il_length = htons((u_short)(len << 3));
        !            96:        sin = (struct sockaddr_in *)&rp->rcb_faddr;
        !            97:        imp_addr_to_leader((struct control_leader *)ip, sin->sin_addr.s_addr);
        !            98:        /* no routing here */
        !            99:        ia = in_iaonnetof(in_netof(sin->sin_addr));
        !           100:        if (ia)
        !           101:                return (impoutput(ia->ia_ifp, m, (struct sockaddr *)sin));
        !           102:        error = ENETUNREACH;
        !           103: bad:
        !           104:        m_freem(m);
        !           105:        return (error);
        !           106: }

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