The Tcpdump Group git mirrors - tcpdump/blob - print-ipnet.c

   1 #ifdef HAVE_CONFIG_H
   2 #include "config.h"
   3 #endif
   4
   5 #include <tcpdump-stdinc.h>
   6
   7 #include "interface.h"
   8
   9 typedef struct ipnet_hdr {
  10         uint8_t         iph_version;
  11         uint8_t         iph_family;
  12         uint16_t        iph_htype;
  13         uint32_t        iph_pktlen;
  14         uint32_t        iph_ifindex;
  15         uint32_t        iph_grifindex;
  16         uint32_t        iph_zsrc;
  17         uint32_t        iph_zdst;
  18 } ipnet_hdr_t;
  19
  20 #define IPH_AF_INET     2               /* Matches Solaris's AF_INET */
  21 #define IPH_AF_INET6    26              /* Matches Solaris's AF_INET6 */
  22
  23 #ifdef DLT_IPNET
  24
  25 static const struct tok ipnet_values[] = {
  26         { IPH_AF_INET,          "IPv4" },
  27         { IPH_AF_INET6,         "IPv6" },
  28         { 0,                    NULL }
  29 };
  30
  31 static inline void
  32 ipnet_hdr_print(netdissect_options *ndo, const u_char *bp, u_int length)
  33 {
  34         const ipnet_hdr_t *hdr;
  35         hdr = (const ipnet_hdr_t *)bp;
  36
  37         ND_PRINT((ndo, "%d > %d", hdr->iph_zsrc, hdr->iph_zdst));
  38
  39         if (!ndo->ndo_qflag) {
  40                 ND_PRINT((ndo,", family %s (%d)",
  41                           tok2str(ipnet_values, "Unknown",
  42                                   hdr->iph_family),
  43                           hdr->iph_family));
  44         } else {
  45                 ND_PRINT((ndo,", %s",
  46                           tok2str(ipnet_values,
  47                                   "Unknown Ethertype (0x%04x)",
  48                                   hdr->iph_family)));
  49         }
  50
  51         ND_PRINT((ndo, ", length %u: ", length));
  52 }
  53
  54 static void
  55 ipnet_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
  56 {
  57         const ipnet_hdr_t *hdr;
  58
  59         if (caplen < sizeof(ipnet_hdr_t)) {
  60                 ND_PRINT((ndo, "[|ipnet]"));
  61                 return;
  62         }
  63
  64         if (ndo->ndo_eflag)
  65                 ipnet_hdr_print(ndo, p, length);
  66
  67         length -= sizeof(ipnet_hdr_t);
  68         caplen -= sizeof(ipnet_hdr_t);
  69         hdr = (const ipnet_hdr_t *)p;
  70         p += sizeof(ipnet_hdr_t);
  71
  72         switch (hdr->iph_family) {
  73
  74         case IPH_AF_INET:
  75                 ip_print(ndo, p, length);
  76                 break;
  77
  78         case IPH_AF_INET6:
  79                 ip6_print(ndo, p, length);
  80                 break;
  81
  82         default:
  83                 if (!ndo->ndo_eflag)
  84                         ipnet_hdr_print(ndo, (const u_char *)hdr,
  85                                         length + sizeof(ipnet_hdr_t));
  86
  87                 if (!ndo->ndo_suppress_default_print)
  88                         ND_DEFAULTPRINT(p, caplen);
  89                 break;
  90         }
  91 }
  92
  93 /*
  94  * This is the top level routine of the printer.  'p' points
  95  * to the ether header of the packet, 'h->ts' is the timestamp,
  96  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
  97  * is the number of bytes actually captured.
  98  */
  99 u_int
 100 ipnet_if_print(netdissect_options *ndo,
 101                const struct pcap_pkthdr *h, const u_char *p)
 102 {
 103         ipnet_print(ndo, p, h->len, h->caplen);
 104
 105         return (sizeof(ipnet_hdr_t));
 106 }
 107
 108 /*
 109  * Local Variables:
 110  * c-style: whitesmith
 111  * c-basic-offset: 8
 112  * End:
 113  */
 114
 115 #endif /* DLT_IPNET */