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Annotation of 43BSDReno/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 is only permitted until one year after the first shipment
        !             6:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !             7:  * binary forms are permitted provided that: (1) source distributions retain
        !             8:  * this entire copyright notice and comment, and (2) distributions including
        !             9:  * binaries display the following acknowledgement:  This product includes
        !            10:  * software developed by the University of California, Berkeley and its
        !            11:  * contributors'' in the documentation or other materials provided with the
        !            12:  * distribution and in all advertising materials mentioning features or use
        !            13:  * of this software.  Neither the name of the University nor the names of
        !            14:  * its contributors may be used to endorse or promote products derived from
        !            15:  * this software without specific prior written permission.
        !            16:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            19:  *
        !            20:  *     @(#)raw_imp.c   7.6 (Berkeley) 6/28/90
        !            21:  */
        !            22: 
        !            23: #include "param.h"
        !            24: #include "mbuf.h"
        !            25: #include "socket.h"
        !            26: #include "protosw.h"
        !            27: #include "socketvar.h"
        !            28: #include "errno.h"
        !            29: 
        !            30: #include "../net/if.h"
        !            31: #include "../net/route.h"
        !            32: #include "../net/raw_cb.h"
        !            33: 
        !            34: #include "../netinet/in.h"
        !            35: #include "../netinet/in_systm.h"
        !            36: #include "../netinet/in_var.h"
        !            37: #include "../netinet/in_pcb.h"
        !            38: #include "if_imp.h"
        !            39: 
        !            40: /*
        !            41:  * Raw interface to IMP.
        !            42:  */
        !            43: 
        !            44: /*
        !            45:  * Generate IMP leader and pass packet to impoutput.
        !            46:  * The user must create a skeletal leader in order to
        !            47:  * communicate message type, message subtype, etc.
        !            48:  * We fill in holes where needed and verify parameters
        !            49:  * supplied by user.
        !            50:  */
        !            51: rimp_output(m, so)
        !            52:        register struct mbuf *m;
        !            53:        struct socket *so;
        !            54: {
        !            55:        struct mbuf *n;
        !            56:        int len, error = 0;
        !            57:        register struct imp_leader *ip;
        !            58:        register struct sockaddr_in *sin;
        !            59:        register struct raw_inpcb *rp = sotorawinpcb(so);
        !            60:        struct in_ifaddr *ia;
        !            61:        struct control_leader *cp;
        !            62: 
        !            63:        /*
        !            64:         * Verify user has supplied necessary space
        !            65:         * for the leader and check parameters in it.
        !            66:         */
        !            67:        if ((m->m_len < sizeof(struct control_leader)) &&
        !            68:            (m = m_pullup(m, sizeof(struct control_leader))) == 0) {
        !            69:                error = EMSGSIZE;       /* XXX */
        !            70:                goto bad;
        !            71:        }
        !            72:        cp = mtod(m, struct control_leader *);
        !            73:        if (cp->dl_mtype == IMPTYPE_DATA)
        !            74:                if (m->m_len < sizeof(struct imp_leader) &&
        !            75:                    (m = m_pullup(m, sizeof(struct imp_leader))) == 0) {
        !            76:                        error = EMSGSIZE;       /* XXX */
        !            77:                        goto bad;
        !            78:                }
        !            79:        ip = mtod(m, struct imp_leader *);
        !            80:        if (ip->il_format != IMP_NFF) {
        !            81:                error = EMSGSIZE;               /* XXX */
        !            82:                goto bad;
        !            83:        }
        !            84: #ifdef notdef
        !            85:        if (ip->il_link != IMPLINK_IP &&
        !            86:            (ip->il_link<IMPLINK_LOWEXPER || ip->il_link>IMPLINK_HIGHEXPER)) {
        !            87:                error = EPERM;
        !            88:                goto bad;
        !            89:        }
        !            90: #endif
        !            91: 
        !            92:        /*
        !            93:         * Fill in IMP leader -- impoutput refrains from rebuilding
        !            94:         * the leader when it sees the protocol family PF_IMPLINK.
        !            95:         * (message size calculated by walking through mbuf's)
        !            96:         */
        !            97:        for (len = 0, n = m; n; n = n->m_next)
        !            98:                len += n->m_len;
        !            99:        ip->il_length = htons((u_short)(len << 3));
        !           100:        sin = (struct sockaddr_in *)rp->rinp_rcb.rcb_faddr;
        !           101:        imp_addr_to_leader((struct control_leader *)ip, sin->sin_addr.s_addr);
        !           102:        /* no routing here */
        !           103:        ia = in_iaonnetof(in_netof(sin->sin_addr));
        !           104:        if (ia)
        !           105:                return (impoutput(ia->ia_ifp, m, (struct sockaddr *)sin));
        !           106:        error = ENETUNREACH;
        !           107: bad:
        !           108:        m_freem(m);
        !           109:        return (error);
        !           110: }

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