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/*
* Linux SLL Decoder
*
*/
#include "config.h"
#include "libtrace_int.h"
#include <sys/types.h>
#include <netinet/in.h>
#include <stdio.h>
#include "libpacketdump.h"
#include "libtrace.h"
#include "arphrd.h"
/* Copied this here because this isn't currently part of our external API -
* maybe we need to think about doing that? */
libtrace_linktype_t arphrd_type_to_libtrace(unsigned int arphrd) {
switch(arphrd) {
case ARPHRD_ETHER: return TRACE_TYPE_ETH;
case ARPHRD_EETHER: return TRACE_TYPE_ETH;
case ARPHRD_IEEE80211: return TRACE_TYPE_80211;
case ARPHRD_80211_RADIOTAP: return TRACE_TYPE_80211_RADIO;
case ARPHRD_PPP: return TRACE_TYPE_NONE;
case ARPHRD_LOOPBACK: return TRACE_TYPE_NONE;
case ARPHRD_NONE: return TRACE_TYPE_NONE;
}
printf("Unknown ARPHRD: %u\n", arphrd);
return ~0U;
}
DLLEXPORT void decode(int link_type ,const char *pkt,unsigned len)
{
libtrace_sll_header_t *sll = (libtrace_sll_header_t *) pkt;
libtrace_linktype_t linktype = link_type;
void *ret;
if (len < sizeof(*sll)) {
printf(" Linux SLL: Truncated (len = %u)\n", len);
return;
}
printf(" Linux SLL: Packet Type = ");
switch(ntohs(sll->pkttype)) {
case TRACE_SLL_HOST: printf("HOST\n"); break;
case TRACE_SLL_BROADCAST: printf("BROADCAST\n"); break;
case TRACE_SLL_MULTICAST: printf("MULTICAST\n"); break;
case TRACE_SLL_OTHERHOST: printf("OTHERHOST\n"); break;
case TRACE_SLL_OUTGOING: printf("OUTGOING\n"); break;
default: printf("Unknown (0x%04x)\n", ntohs(sll->pkttype));
}
printf(" Linux SLL: Hardware Address Type = 0x%04x\n", ntohs(sll->hatype));
printf(" Linux SLL: Hardware Address Length = %u\n", ntohs(sll->halen));
printf(" Linux SLL: Hardware Address = %s\n", trace_ether_ntoa( (sll->addr), NULL));
printf(" Linux SLL: Protocol = 0x%04x\n", ntohs(sll->protocol));
/* Decide how to continue processing... */
/* Do we recognise the hardware address type? */
ret=trace_get_payload_from_meta(pkt, &linktype, &len);
if (ntohs(sll->hatype) == ARPHRD_ETHER ||
ntohs(sll->hatype) == ARPHRD_LOOPBACK) {
if (ntohs(sll->protocol) == 0x0060) {
decode_next(ret, len, "link",
arphrd_type_to_libtrace(ntohs(sll->hatype)));
}
else
decode_next(pkt + sizeof(*sll), len - sizeof(*sll),
"eth", ntohs(sll->protocol));
}
else {
decode_next(ret, len, "link",
arphrd_type_to_libtrace(ntohs(sll->hatype)));
}
return;
}
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