source: libpacketdump/link_6.c @ c7062df

/* 
 * Linux SLL Decoder 
 * 
 */

#include <sys/types.h>
#include <netinet/in.h>
#include <stdio.h>
#include "libpacketdump.h"
#include "libtrace.h"
#include "libtrace_int.h"

DLLEXPORT void decode(int link_type UNUSED,const char *pkt,unsigned len) 
{
        libtrace_sll_header_t *sll = (libtrace_sll_header_t *) pkt;
        uint16_t type;
        
        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? */
        type = arphrd_type_to_libtrace(ntohs(sll->hatype));
        if (type != 65535) { 
                decode_next(pkt + sizeof(*sll), len - sizeof(*sll), "link", type);
                return;
        }

        /* Meh.. pass it off to eth decoder */
        decode_next(pkt + sizeof(*sll), len - sizeof(*sll), "eth", ntohs(sll->protocol));

}