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Annotation of XNU/bsd/netns/ns_output.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1984, 1985, 1986, 1987, 1993
        !            24:  *     The Regents of the University of California.  All rights reserved.
        !            25:  *
        !            26:  * Redistribution and use in source and binary forms, with or without
        !            27:  * modification, are permitted provided that the following conditions
        !            28:  * are met:
        !            29:  * 1. Redistributions of source code must retain the above copyright
        !            30:  *    notice, this list of conditions and the following disclaimer.
        !            31:  * 2. Redistributions in binary form must reproduce the above copyright
        !            32:  *    notice, this list of conditions and the following disclaimer in the
        !            33:  *    documentation and/or other materials provided with the distribution.
        !            34:  * 3. All advertising materials mentioning features or use of this software
        !            35:  *    must display the following acknowledgement:
        !            36:  *     This product includes software developed by the University of
        !            37:  *     California, Berkeley and its contributors.
        !            38:  * 4. Neither the name of the University nor the names of its contributors
        !            39:  *    may be used to endorse or promote products derived from this software
        !            40:  *    without specific prior written permission.
        !            41:  *
        !            42:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            43:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            44:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            45:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            46:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            47:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            48:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            49:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            50:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            51:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            52:  * SUCH DAMAGE.
        !            53:  *
        !            54:  *     @(#)ns_output.c 8.1 (Berkeley) 6/10/93
        !            55:  */
        !            56: 
        !            57: #include <sys/param.h>
        !            58: #include <sys/malloc.h>
        !            59: #include <sys/mbuf.h>
        !            60: #include <sys/errno.h>
        !            61: #include <sys/socket.h>
        !            62: #include <sys/socketvar.h>
        !            63: 
        !            64: #include <net/if.h>
        !            65: #include <net/route.h>
        !            66: 
        !            67: #include <netns/ns.h>
        !            68: #include <netns/ns_if.h>
        !            69: #include <netns/idp.h>
        !            70: #include <netns/idp_var.h>
        !            71: 
        !            72: #ifdef vax
        !            73: #include <machine/mtpr.h>
        !            74: #endif
        !            75: int ns_hold_output = 0;
        !            76: int ns_copy_output = 0;
        !            77: int ns_output_cnt = 0;
        !            78: struct mbuf *ns_lastout;
        !            79: 
        !            80: ns_output(m0, ro, flags)
        !            81:        struct mbuf *m0;
        !            82:        struct route *ro;
        !            83:        int flags;
        !            84: {
        !            85:        register struct idp *idp = mtod(m0, struct idp *);
        !            86:        register struct ifnet *ifp = 0;
        !            87:        int error = 0;
        !            88:        struct route idproute;
        !            89:        struct sockaddr_ns *dst;
        !            90:        extern int idpcksum;
        !            91: 
        !            92:        if (ns_hold_output) {
        !            93:                if (ns_lastout) {
        !            94:                        (void)m_free(ns_lastout);
        !            95:                }
        !            96:                ns_lastout = m_copy(m0, 0, (int)M_COPYALL);
        !            97:        }
        !            98:        /*
        !            99:         * Route packet.
        !           100:         */
        !           101:        if (ro == 0) {
        !           102:                ro = &idproute;
        !           103:                bzero((caddr_t)ro, sizeof (*ro));
        !           104:        }
        !           105:        dst = (struct sockaddr_ns *)&ro->ro_dst;
        !           106:        if (ro->ro_rt == 0) {
        !           107:                dst->sns_family = AF_NS;
        !           108:                dst->sns_len = sizeof (*dst);
        !           109:                dst->sns_addr = idp->idp_dna;
        !           110:                dst->sns_addr.x_port = 0;
        !           111:                /*
        !           112:                 * If routing to interface only,
        !           113:                 * short circuit routing lookup.
        !           114:                 */
        !           115:                if (flags & NS_ROUTETOIF) {
        !           116:                        struct ns_ifaddr *ia = ns_iaonnetof(&idp->idp_dna);
        !           117: 
        !           118:                        if (ia == 0) {
        !           119:                                error = ENETUNREACH;
        !           120:                                goto bad;
        !           121:                        }
        !           122:                        ifp = ia->ia_ifp;
        !           123:                        goto gotif;
        !           124:                }
        !           125:                rtalloc(ro);
        !           126:        } else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) {
        !           127:                /*
        !           128:                 * The old route has gone away; try for a new one.
        !           129:                 */
        !           130:                rtfree(ro->ro_rt);
        !           131:                ro->ro_rt = NULL;
        !           132:                rtalloc(ro);
        !           133:        }
        !           134:        if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
        !           135:                error = ENETUNREACH;
        !           136:                goto bad;
        !           137:        }
        !           138:        ro->ro_rt->rt_use++;
        !           139:        if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
        !           140:                dst = (struct sockaddr_ns *)ro->ro_rt->rt_gateway;
        !           141: gotif:
        !           142: 
        !           143:        /*
        !           144:         * Look for multicast addresses and
        !           145:         * and verify user is allowed to send
        !           146:         * such a packet.
        !           147:         */
        !           148:        if (dst->sns_addr.x_host.c_host[0]&1) {
        !           149:                if ((ifp->if_flags & IFF_BROADCAST) == 0) {
        !           150:                        error = EADDRNOTAVAIL;
        !           151:                        goto bad;
        !           152:                }
        !           153:                if ((flags & NS_ALLOWBROADCAST) == 0) {
        !           154:                        error = EACCES;
        !           155:                        goto bad;
        !           156:                }
        !           157:        }
        !           158: 
        !           159:        if (htons(idp->idp_len) <= ifp->if_mtu) {
        !           160:                ns_output_cnt++;
        !           161:                if (ns_copy_output) {
        !           162:                        ns_watch_output(m0, ifp);
        !           163:                }
        !           164:                error = (*ifp->if_output)(ifp, m0,
        !           165:                                        (struct sockaddr *)dst, ro->ro_rt);
        !           166:                goto done;
        !           167:        } else error = EMSGSIZE;
        !           168: 
        !           169: 
        !           170: bad:
        !           171:        if (ns_copy_output) {
        !           172:                ns_watch_output(m0, ifp);
        !           173:        }
        !           174:        m_freem(m0);
        !           175: done:
        !           176:        if (ro == &idproute && (flags & NS_ROUTETOIF) == 0 && ro->ro_rt) {
        !           177:                RTFREE(ro->ro_rt);
        !           178:                ro->ro_rt = 0;
        !           179:        }
        !           180:        return (error);
        !           181: }

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