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Annotation of 43BSDReno/sys/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 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:  *     @(#)ns_output.c 7.7 (Berkeley) 6/28/90
        !            21:  */
        !            22: 
        !            23: #include "param.h"
        !            24: #include "malloc.h"
        !            25: #include "mbuf.h"
        !            26: #include "errno.h"
        !            27: #include "socket.h"
        !            28: #include "socketvar.h"
        !            29: 
        !            30: #include "../net/if.h"
        !            31: #include "../net/route.h"
        !            32: 
        !            33: #include "ns.h"
        !            34: #include "ns_if.h"
        !            35: #include "idp.h"
        !            36: #include "idp_var.h"
        !            37: 
        !            38: #ifdef vax
        !            39: #include "../vax/mtpr.h"
        !            40: #endif
        !            41: int ns_hold_output = 0;
        !            42: int ns_copy_output = 0;
        !            43: int ns_output_cnt = 0;
        !            44: struct mbuf *ns_lastout;
        !            45: 
        !            46: ns_output(m0, ro, flags)
        !            47:        struct mbuf *m0;
        !            48:        struct route *ro;
        !            49:        int flags;
        !            50: {
        !            51:        register struct idp *idp = mtod(m0, struct idp *);
        !            52:        register struct ifnet *ifp = 0;
        !            53:        int error = 0;
        !            54:        struct route idproute;
        !            55:        struct sockaddr_ns *dst;
        !            56:        extern int idpcksum;
        !            57: 
        !            58:        if (ns_hold_output) {
        !            59:                if (ns_lastout) {
        !            60:                        (void)m_free(ns_lastout);
        !            61:                }
        !            62:                ns_lastout = m_copy(m0, 0, (int)M_COPYALL);
        !            63:        }
        !            64:        /*
        !            65:         * Route packet.
        !            66:         */
        !            67:        if (ro == 0) {
        !            68:                ro = &idproute;
        !            69:                bzero((caddr_t)ro, sizeof (*ro));
        !            70:        }
        !            71:        dst = (struct sockaddr_ns *)&ro->ro_dst;
        !            72:        if (ro->ro_rt == 0) {
        !            73:                dst->sns_family = AF_NS;
        !            74:                dst->sns_len = sizeof (*dst);
        !            75:                dst->sns_addr = idp->idp_dna;
        !            76:                dst->sns_addr.x_port = 0;
        !            77:                /*
        !            78:                 * If routing to interface only,
        !            79:                 * short circuit routing lookup.
        !            80:                 */
        !            81:                if (flags & NS_ROUTETOIF) {
        !            82:                        struct ns_ifaddr *ia = ns_iaonnetof(&idp->idp_dna);
        !            83: 
        !            84:                        if (ia == 0) {
        !            85:                                error = ENETUNREACH;
        !            86:                                goto bad;
        !            87:                        }
        !            88:                        ifp = ia->ia_ifp;
        !            89:                        goto gotif;
        !            90:                }
        !            91:                rtalloc(ro);
        !            92:        } else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) {
        !            93:                /*
        !            94:                 * The old route has gone away; try for a new one.
        !            95:                 */
        !            96:                rtfree(ro->ro_rt);
        !            97:                ro->ro_rt = NULL;
        !            98:                rtalloc(ro);
        !            99:        }
        !           100:        if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
        !           101:                error = ENETUNREACH;
        !           102:                goto bad;
        !           103:        }
        !           104:        ro->ro_rt->rt_use++;
        !           105:        if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
        !           106:                dst = (struct sockaddr_ns *)ro->ro_rt->rt_gateway;
        !           107: gotif:
        !           108: 
        !           109:        /*
        !           110:         * Look for multicast addresses and
        !           111:         * and verify user is allowed to send
        !           112:         * such a packet.
        !           113:         */
        !           114:        if (dst->sns_addr.x_host.c_host[0]&1) {
        !           115:                if ((ifp->if_flags & IFF_BROADCAST) == 0) {
        !           116:                        error = EADDRNOTAVAIL;
        !           117:                        goto bad;
        !           118:                }
        !           119:                if ((flags & NS_ALLOWBROADCAST) == 0) {
        !           120:                        error = EACCES;
        !           121:                        goto bad;
        !           122:                }
        !           123:        }
        !           124: 
        !           125:        if (htons(idp->idp_len) <= ifp->if_mtu) {
        !           126:                ns_output_cnt++;
        !           127:                if (ns_copy_output) {
        !           128:                        ns_watch_output(m0, ifp);
        !           129:                }
        !           130:                error = (*ifp->if_output)(ifp, m0,
        !           131:                                        (struct sockaddr *)dst, ro->ro_rt);
        !           132:                goto done;
        !           133:        } else error = EMSGSIZE;
        !           134: 
        !           135: 
        !           136: bad:
        !           137:        if (ns_copy_output) {
        !           138:                ns_watch_output(m0, ifp);
        !           139:        }
        !           140:        m_freem(m0);
        !           141: done:
        !           142:        if (ro == &idproute && (flags & NS_ROUTETOIF) == 0 && ro->ro_rt) {
        !           143:                RTFREE(ro->ro_rt);
        !           144:                ro->ro_rt = 0;
        !           145:        }
        !           146:        return (error);
        !           147: }

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