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Annotation of 43BSDTahoe/sys/netimp/raw_imp.c, revision 1.1.1.1

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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