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Annotation of Net2/netns/ns_output.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1984, 1985, 1986, 1987 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:  *     @(#)ns_output.c 7.8 (Berkeley) 12/16/90
        !            34:  */
        !            35: 
        !            36: #include "param.h"
        !            37: #include "malloc.h"
        !            38: #include "mbuf.h"
        !            39: #include "errno.h"
        !            40: #include "socket.h"
        !            41: #include "socketvar.h"
        !            42: 
        !            43: #include "../net/if.h"
        !            44: #include "../net/route.h"
        !            45: 
        !            46: #include "ns.h"
        !            47: #include "ns_if.h"
        !            48: #include "idp.h"
        !            49: #include "idp_var.h"
        !            50: 
        !            51: #ifdef vax
        !            52: #include "vax/include/mtpr.h"
        !            53: #endif
        !            54: int ns_hold_output = 0;
        !            55: int ns_copy_output = 0;
        !            56: int ns_output_cnt = 0;
        !            57: struct mbuf *ns_lastout;
        !            58: 
        !            59: ns_output(m0, ro, flags)
        !            60:        struct mbuf *m0;
        !            61:        struct route *ro;
        !            62:        int flags;
        !            63: {
        !            64:        register struct idp *idp = mtod(m0, struct idp *);
        !            65:        register struct ifnet *ifp = 0;
        !            66:        int error = 0;
        !            67:        struct route idproute;
        !            68:        struct sockaddr_ns *dst;
        !            69:        extern int idpcksum;
        !            70: 
        !            71:        if (ns_hold_output) {
        !            72:                if (ns_lastout) {
        !            73:                        (void)m_free(ns_lastout);
        !            74:                }
        !            75:                ns_lastout = m_copy(m0, 0, (int)M_COPYALL);
        !            76:        }
        !            77:        /*
        !            78:         * Route packet.
        !            79:         */
        !            80:        if (ro == 0) {
        !            81:                ro = &idproute;
        !            82:                bzero((caddr_t)ro, sizeof (*ro));
        !            83:        }
        !            84:        dst = (struct sockaddr_ns *)&ro->ro_dst;
        !            85:        if (ro->ro_rt == 0) {
        !            86:                dst->sns_family = AF_NS;
        !            87:                dst->sns_len = sizeof (*dst);
        !            88:                dst->sns_addr = idp->idp_dna;
        !            89:                dst->sns_addr.x_port = 0;
        !            90:                /*
        !            91:                 * If routing to interface only,
        !            92:                 * short circuit routing lookup.
        !            93:                 */
        !            94:                if (flags & NS_ROUTETOIF) {
        !            95:                        struct ns_ifaddr *ia = ns_iaonnetof(&idp->idp_dna);
        !            96: 
        !            97:                        if (ia == 0) {
        !            98:                                error = ENETUNREACH;
        !            99:                                goto bad;
        !           100:                        }
        !           101:                        ifp = ia->ia_ifp;
        !           102:                        goto gotif;
        !           103:                }
        !           104:                rtalloc(ro);
        !           105:        } else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) {
        !           106:                /*
        !           107:                 * The old route has gone away; try for a new one.
        !           108:                 */
        !           109:                rtfree(ro->ro_rt);
        !           110:                ro->ro_rt = NULL;
        !           111:                rtalloc(ro);
        !           112:        }
        !           113:        if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
        !           114:                error = ENETUNREACH;
        !           115:                goto bad;
        !           116:        }
        !           117:        ro->ro_rt->rt_use++;
        !           118:        if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
        !           119:                dst = (struct sockaddr_ns *)ro->ro_rt->rt_gateway;
        !           120: gotif:
        !           121: 
        !           122:        /*
        !           123:         * Look for multicast addresses and
        !           124:         * and verify user is allowed to send
        !           125:         * such a packet.
        !           126:         */
        !           127:        if (dst->sns_addr.x_host.c_host[0]&1) {
        !           128:                if ((ifp->if_flags & IFF_BROADCAST) == 0) {
        !           129:                        error = EADDRNOTAVAIL;
        !           130:                        goto bad;
        !           131:                }
        !           132:                if ((flags & NS_ALLOWBROADCAST) == 0) {
        !           133:                        error = EACCES;
        !           134:                        goto bad;
        !           135:                }
        !           136:        }
        !           137: 
        !           138:        if (htons(idp->idp_len) <= ifp->if_mtu) {
        !           139:                ns_output_cnt++;
        !           140:                if (ns_copy_output) {
        !           141:                        ns_watch_output(m0, ifp);
        !           142:                }
        !           143:                error = (*ifp->if_output)(ifp, m0,
        !           144:                                        (struct sockaddr *)dst, ro->ro_rt);
        !           145:                goto done;
        !           146:        } else error = EMSGSIZE;
        !           147: 
        !           148: 
        !           149: bad:
        !           150:        if (ns_copy_output) {
        !           151:                ns_watch_output(m0, ifp);
        !           152:        }
        !           153:        m_freem(m0);
        !           154: done:
        !           155:        if (ro == &idproute && (flags & NS_ROUTETOIF) == 0 && ro->ro_rt) {
        !           156:                RTFREE(ro->ro_rt);
        !           157:                ro->ro_rt = 0;
        !           158:        }
        !           159:        return (error);
        !           160: }

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