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Annotation of 43BSDTahoe/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 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:  *     @(#)ns_output.c 7.3 (Berkeley) 6/29/88
        !            18:  */
        !            19: 
        !            20: #include "param.h"
        !            21: #include "mbuf.h"
        !            22: #include "errno.h"
        !            23: #include "socket.h"
        !            24: #include "socketvar.h"
        !            25: 
        !            26: #include "../net/if.h"
        !            27: #include "../net/route.h"
        !            28: 
        !            29: #include "ns.h"
        !            30: #include "ns_if.h"
        !            31: #include "idp.h"
        !            32: #include "idp_var.h"
        !            33: 
        !            34: #ifdef vax
        !            35: #include "../vax/mtpr.h"
        !            36: #endif
        !            37: int ns_hold_output = 0;
        !            38: int ns_copy_output = 0;
        !            39: int ns_output_cnt = 0;
        !            40: struct mbuf *ns_lastout;
        !            41: 
        !            42: ns_output(m0, ro, flags)
        !            43:        struct mbuf *m0;
        !            44:        struct route *ro;
        !            45:        int flags;
        !            46: {
        !            47:        register struct idp *idp = mtod(m0, struct idp *);
        !            48:        register struct ifnet *ifp = 0;
        !            49:        int error = 0;
        !            50:        struct route idproute;
        !            51:        struct sockaddr_ns *dst;
        !            52:        extern int idpcksum;
        !            53: 
        !            54:        if (ns_hold_output) {
        !            55:                if (ns_lastout) {
        !            56:                        (void)m_free(ns_lastout);
        !            57:                }
        !            58:                ns_lastout = m_copy(m0, 0, (int)M_COPYALL);
        !            59:        }
        !            60:        /*
        !            61:         * Route packet.
        !            62:         */
        !            63:        if (ro == 0) {
        !            64:                ro = &idproute;
        !            65:                bzero((caddr_t)ro, sizeof (*ro));
        !            66:        }
        !            67:        dst = (struct sockaddr_ns *)&ro->ro_dst;
        !            68:        if (ro->ro_rt == 0) {
        !            69:                dst->sns_family = AF_NS;
        !            70:                dst->sns_addr = idp->idp_dna;
        !            71:                dst->sns_addr.x_port = 0;
        !            72:                /*
        !            73:                 * If routing to interface only,
        !            74:                 * short circuit routing lookup.
        !            75:                 */
        !            76:                if (flags & NS_ROUTETOIF) {
        !            77:                        struct ns_ifaddr *ia = ns_iaonnetof(&idp->idp_dna);
        !            78: 
        !            79:                        if (ia == 0) {
        !            80:                                error = ENETUNREACH;
        !            81:                                goto bad;
        !            82:                        }
        !            83:                        ifp = ia->ia_ifp;
        !            84:                        goto gotif;
        !            85:                }
        !            86:                rtalloc(ro);
        !            87:        } else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) {
        !            88:                /*
        !            89:                 * The old route has gone away; try for a new one.
        !            90:                 */
        !            91:                rtfree(ro->ro_rt);
        !            92:                ro->ro_rt = NULL;
        !            93:                rtalloc(ro);
        !            94:        }
        !            95:        if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
        !            96:                error = ENETUNREACH;
        !            97:                goto bad;
        !            98:        }
        !            99:        ro->ro_rt->rt_use++;
        !           100:        if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
        !           101:                dst = (struct sockaddr_ns *)&ro->ro_rt->rt_gateway;
        !           102: gotif:
        !           103: 
        !           104:        /*
        !           105:         * Look for multicast addresses and
        !           106:         * and verify user is allowed to send
        !           107:         * such a packet.
        !           108:         */
        !           109:        if (dst->sns_addr.x_host.c_host[0]&1) {
        !           110:                if ((ifp->if_flags & IFF_BROADCAST) == 0) {
        !           111:                        error = EADDRNOTAVAIL;
        !           112:                        goto bad;
        !           113:                }
        !           114:                if ((flags & NS_ALLOWBROADCAST) == 0) {
        !           115:                        error = EACCES;
        !           116:                        goto bad;
        !           117:                }
        !           118:        }
        !           119: 
        !           120:        if (htons(idp->idp_len) <= ifp->if_mtu) {
        !           121:                ns_output_cnt++;
        !           122:                if (ns_copy_output) {
        !           123:                        ns_watch_output(m0, ifp);
        !           124:                }
        !           125:                error = (*ifp->if_output)(ifp, m0, (struct sockaddr *)dst);
        !           126:                goto done;
        !           127:        } else error = EMSGSIZE;
        !           128: 
        !           129: 
        !           130: bad:
        !           131:        if (ns_copy_output) {
        !           132:                ns_watch_output(m0, ifp);
        !           133:        }
        !           134:        m_freem(m0);
        !           135: done:
        !           136:        if (ro == &idproute && (flags & NS_ROUTETOIF) == 0 && ro->ro_rt)
        !           137:                RTFREE(ro->ro_rt);
        !           138:        return (error);
        !           139: }

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