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- /* $Id$ */
- /*
- * Copyright (c) 2001-2010 Aaron Turner <aturner at synfin dot net>
- * Copyright (c) 2013-2017 Fred Klassen <tcpreplay at appneta dot com> - AppNeta
- *
- * The Tcpreplay Suite of tools is free software: you can redistribute it
- * and/or modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation, either version 3 of the
- * License, or with the authors permission any later version.
- *
- * The Tcpreplay Suite is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with the Tcpreplay Suite. If not, see <http://www.gnu.org/licenses/>.
- */
- #include <assert.h>
- #include "config.h"
- #include "defines.h"
- #include "tcpedit.h"
- #include "dlt.h"
- /**
- * takes in a libpcap DLT_ type and returns the length of the layer2 header
- * returns -1 for unsupported DLT
- */
- int
- dlt2layer2len(tcpedit_t *tcpedit, int dlt)
- {
- assert(tcpedit);
- int len;
- switch(dlt) {
- /*
- case DLT_USER:
- len = tcpedit->l2.len;
- break;
- */
- case DLT_NULL:
- len = 2;
- break;
- case DLT_RAW:
- len = 0;
- break;
- case DLT_EN10MB:
- len = 12;
- break;
- /*
- case DLT_VLAN:
- len = 14;
- break;
- */
- case DLT_LINUX_SLL:
- len = 16;
- break;
- case DLT_PPP_SERIAL:
- case DLT_C_HDLC:
- len = 4;
- break;
- case DLT_JUNIPER_ETHER:
- len = 36;
- break;
- default:
- tcpedit_seterr(tcpedit, "Invalid DLT Type: %d", dlt);
- len = -1;
- }
- return len;
- }
- /**
- * each DLT type may require one or more user specified Layer 2 field
- * to be able to rewrite it as plain ethernet DLT_EN10MB
- * returns -1 on error or >= 0 on success
- */
- int
- dltrequires(tcpedit_t *tcpedit, int dlt)
- {
- assert(tcpedit);
- int req = TCPEDIT_DLT_OK; // no change required by default
- switch(dlt) {
- case DLT_JUNIPER_ETHER:
- case DLT_EN10MB:
- /* case DLT_USER:
- case DLT_VLAN: */
- /* we have everthing we need in the original packet */
- break;
- case DLT_NULL:
- case DLT_RAW:
- case DLT_C_HDLC:
- case DLT_PPP_SERIAL:
- req = TCPEDIT_DLT_SRC + TCPEDIT_DLT_DST;
- /* we just have the proto */
- break;
- case DLT_LINUX_SLL:
- /* we have proto & SRC address */
- req = TCPEDIT_DLT_DST;
- break;
- default:
- tcpedit_seterr(tcpedit, "Invalid DLT Type: %d", dlt);
- req = -1;
- }
- return req;
- }
- /**
- * returns the default MTU size for the given DLT type. Returns -1
- * for invalid DLT
- */
- int
- dlt2mtu(tcpedit_t *tcpedit, int dlt)
- {
- int mtu;
- assert(tcpedit);
- switch (dlt) {
- /* case DLT_VLAN:
- case DLT_USER: */
- case DLT_PPP_SERIAL:
- case DLT_EN10MB:
- case DLT_RAW:
- case DLT_C_HDLC:
- case DLT_JUNIPER_ETHER:
- mtu = 1500;
- break;
- case DLT_LINUX_SLL:
- mtu = 16436;
- break;
- case DLT_LOOP:
- mtu = 16384;
- break;
- default:
- tcpedit_seterr(tcpedit, "Invalid DLT Type: %d", dlt);
- mtu = -1;
- break;
- }
- return mtu;
- }
- /**
- * Returns the current layer 2 len based on the
- * DLT of the pcap or the --dlink value or -1 on error.
- * You need to call this function AFTER rewriting the layer 2 header
- * for it to be at all useful.
- */
- int
- layer2len(tcpedit_t *tcpedit)
- {
- assert(tcpedit);
-
- return tcpedit->dlt_ctx->l2len;
- }
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