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 <stdio.h>
   8 #include <pcap.h>
   9
  10 #include "netdissect.h"
  11 #include "interface.h"
  12 #include "addrtoname.h"
  13 #include "ipnet.h"
  14
  15 #ifdef DLT_IPNET
  16
  17 const struct tok ipnet_values[] = {
  18         { IPH_AF_INET,          "IPv4" },
  19         { IPH_AF_INET6,         "IPv6" },
  20         { 0,                    NULL }
  21 };
  22
  23 static inline void
  24 ipnet_hdr_print(struct netdissect_options *ndo, const u_char *bp, u_int length)
  25 {
  26         const ipnet_hdr_t *hdr;
  27         hdr = (const ipnet_hdr_t *)bp;
  28
  29         ND_PRINT((ndo, "%d > %d", hdr->iph_zsrc, hdr->iph_zdst));
  30
  31         if (!ndo->ndo_qflag) {
  32                 ND_PRINT((ndo,", family %s (%d)",
  33                           tok2str(ipnet_values, "Unknown",
  34                                   hdr->iph_family),
  35                           hdr->iph_family));
  36         } else {
  37                 ND_PRINT((ndo,", %s",
  38                           tok2str(ipnet_values,
  39                                   "Unknown Ethertype (0x%04x)",
  40                                   hdr->iph_family)));
  41         }
  42
  43         ND_PRINT((ndo, ", length %u: ", length));
  44 }
  45
  46 static void
  47 ipnet_print(struct netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
  48 {
  49         ipnet_hdr_t *hdr;
  50
  51         if (caplen < sizeof(ipnet_hdr_t)) {
  52                 ND_PRINT((ndo, "[|ipnet]"));
  53                 return;
  54         }
  55
  56         if (ndo->ndo_eflag)
  57                 ipnet_hdr_print(ndo, p, length);
  58
  59         length -= sizeof(ipnet_hdr_t);
  60         caplen -= sizeof(ipnet_hdr_t);
  61         hdr = (ipnet_hdr_t *)p;
  62         p += sizeof(ipnet_hdr_t);
  63
  64         switch (hdr->iph_family) {
  65
  66         case IPH_AF_INET:
  67                 ip_print(ndo, p, length);
  68                 break;
  69
  70 #ifdef INET6
  71         case IPH_AF_INET6:
  72                 ip6_print(p, length);
  73                 break;
  74 #endif /*INET6*/
  75
  76         default:
  77                 if (!ndo->ndo_eflag)
  78                         ipnet_hdr_print(ndo, (u_char *)hdr,
  79                                         length + sizeof(ipnet_hdr_t));
  80
  81                 if (!ndo->ndo_suppress_default_print)
  82                         ndo->ndo_default_print(ndo, p, caplen);
  83                 break;
  84         }
  85 }
  86
  87 /*
  88  * This is the top level routine of the printer.  'p' points
  89  * to the ether header of the packet, 'h->ts' is the timestamp,
  90  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
  91  * is the number of bytes actually captured.
  92  */
  93 u_int
  94 ipnet_if_print(struct netdissect_options *ndo,
  95                const struct pcap_pkthdr *h, const u_char *p)
  96 {
  97         ipnet_print(ndo, p, h->len, h->caplen);
  98
  99         return (sizeof(ipnet_hdr_t));
 100 }
 101
 102 /*
 103  * Local Variables:
 104  * c-style: whitesmith
 105  * c-basic-offset: 8
 106  * End:
 107  */
 108
 109 #endif /* DLT_IPNET */