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

1.1       root        1: /*
                      2:  * Copyright (c) 1982, 1986 Regents of the University of California.
                      3:  * All rights reserved.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  *
                      6:  *     @(#)raw_imp.c   7.1 (Berkeley) 6/4/86
                      7:  */
                      8: 
                      9: #include "param.h"
                     10: #include "mbuf.h"
                     11: #include "socket.h"
                     12: #include "protosw.h"
                     13: #include "socketvar.h"
                     14: #include "errno.h"
                     15: 
                     16: #include "../net/if.h"
                     17: #include "../net/route.h"
                     18: #include "../net/raw_cb.h"
                     19: 
                     20: #include "../netinet/in.h"
                     21: #include "../netinet/in_systm.h"
                     22: #include "../netinet/in_var.h"
                     23: #include "if_imp.h"
                     24: 
                     25: /*
                     26:  * Raw interface to IMP.
                     27:  */
                     28: 
                     29: /*
                     30:  * Generate IMP leader and pass packet to impoutput.
                     31:  * The user must create a skeletal leader in order to
                     32:  * communicate message type, message subtype, etc.
                     33:  * We fill in holes where needed and verify parameters
                     34:  * supplied by user.
                     35:  */
                     36: rimp_output(m, so)
                     37:        register struct mbuf *m;
                     38:        struct socket *so;
                     39: {
                     40:        struct mbuf *n;
                     41:        int len, error = 0;
                     42:        register struct imp_leader *ip;
                     43:        register struct sockaddr_in *sin;
                     44:        register struct rawcb *rp = sotorawcb(so);
                     45:        struct in_ifaddr *ia;
                     46:        struct control_leader *cp;
                     47: 
                     48:        /*
                     49:         * Verify user has supplied necessary space
                     50:         * for the leader and check parameters in it.
                     51:         */
                     52:        if ((m->m_off > MMAXOFF || m->m_len < sizeof(struct control_leader)) &&
                     53:            (m = m_pullup(m, sizeof(struct control_leader))) == 0) {
                     54:                error = EMSGSIZE;       /* XXX */
                     55:                goto bad;
                     56:        }
                     57:        cp = mtod(m, struct control_leader *);
                     58:        if (cp->dl_mtype == IMPTYPE_DATA)
                     59:                if (m->m_len < sizeof(struct imp_leader) &&
                     60:                    (m = m_pullup(m, sizeof(struct imp_leader))) == 0) {
                     61:                        error = EMSGSIZE;       /* XXX */
                     62:                        goto bad;
                     63:                }
                     64:        ip = mtod(m, struct imp_leader *);
                     65:        if (ip->il_format != IMP_NFF) {
                     66:                error = EMSGSIZE;               /* XXX */
                     67:                goto bad;
                     68:        }
                     69: #ifdef notdef
                     70:        if (ip->il_link != IMPLINK_IP &&
                     71:            (ip->il_link<IMPLINK_LOWEXPER || ip->il_link>IMPLINK_HIGHEXPER)) {
                     72:                error = EPERM;
                     73:                goto bad;
                     74:        }
                     75: #endif
                     76: 
                     77:        /*
                     78:         * Fill in IMP leader -- impoutput refrains from rebuilding
                     79:         * the leader when it sees the protocol family PF_IMPLINK.
                     80:         * (message size calculated by walking through mbuf's)
                     81:         */
                     82:        for (len = 0, n = m; n; n = n->m_next)
                     83:                len += n->m_len;
                     84:        ip->il_length = htons((u_short)(len << 3));
                     85:        sin = (struct sockaddr_in *)&rp->rcb_faddr;
                     86:        imp_addr_to_leader(ip, sin->sin_addr.s_addr);   /* BRL */
                     87:        /* no routing here */
                     88:        ia = in_iaonnetof(in_netof(sin->sin_addr));
                     89:        if (ia)
                     90:                return (impoutput(ia->ia_ifp, m, (struct sockaddr *)sin));
                     91:        error = ENETUNREACH;
                     92: bad:
                     93:        m_freem(m);
                     94:        return (error);
                     95: }

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