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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 | /* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* * Copyright (c) 1997-1998 Apple Computer, Inc. * All Rights Reserved. */ /* * Modified, March 17, 1997 by Tuyen Nguyen for MacOSX. */ #include <sys/errno.h> #include <sys/types.h> #include <sys/param.h> #include <machine/spl.h> #include <sys/systm.h> #include <sys/kernel.h> #include <sys/proc.h> #include <sys/filedesc.h> #include <sys/fcntl.h> #include <sys/mbuf.h> #include <sys/socket.h> #include <sys/socketvar.h> #include <net/if.h> #include <netat/sysglue.h> #include <netat/appletalk.h> #include <netat/ep.h> #include <netat/ddp.h> #include <netat/debug.h> #include <netat/at_snmp.h> #include <netat/at_pcb.h> #include <netat/at_var.h> extern snmpStats_t snmpStats; /****************************************************************/ /* */ /* */ /* Echo Protocol */ /* */ /* */ /****************************************************************/ void ep_input (mp, ifID) gbuf_t *mp; register at_ifaddr_t *ifID; { register at_ddp_t *ddp; snmpStats.ec_echoReq++; ddp = (at_ddp_t *)gbuf_rptr(mp); /* ep packets that have a source broadcast can cause * possible broadcast storms, prevent that here */ if ( NET_VALUE(ddp->src_net) == 0 || ddp->src_node == 255) { gbuf_freem(mp); return; } /* * Check if this AEP message is for us or need to be forwarded */ if (!ROUTING_MODE || (ifID->ifThisNode.s_net == NET_VALUE(ddp->dst_net)) && (ifID->ifThisNode.s_node == ddp->dst_node)) { dPrintf(D_M_AEP, D_L_INFO, ("aep_input: received for this port from %d:%d\n", NET_VALUE(ddp->src_net), ddp->src_node)); if (ddp->type == DDP_ECHO && ddp->data[0] == EP_REQUEST) { ddp->data[0] = EP_REPLY; NET_NET(ddp->dst_net, ddp->src_net); ddp->dst_node = ddp->src_node; ddp->dst_socket = ddp->src_socket; /* send the packet out.... */ snmpStats.ec_echoReply++; (void)ddp_output(&mp, (at_socket)EP_SOCKET, FALSE); } else gbuf_freem(mp); } else { dPrintf(D_M_AEP, D_L_INFO, ("aep_input: calling routing needed from %d:%d to %d:%d\n", NET_VALUE(ddp->src_net), ddp->src_node, NET_VALUE(ddp->dst_net), ddp->dst_node)); routing_needed(mp, ifID, TRUE); } return; } |