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
  14 typedef struct ipnet_hdr {
  15         uint8_t         iph_version;
  16         uint8_t         iph_family;
  17         uint16_t        iph_htype;
  18         uint32_t        iph_pktlen;
  19         uint32_t        iph_ifindex;
  20         uint32_t        iph_grifindex;
  21         uint32_t        iph_zsrc;
  22         uint32_t        iph_zdst;
  23 } ipnet_hdr_t;
  24
  25 #define IPH_AF_INET     2               /* Matches Solaris's AF_INET */
  26 #define IPH_AF_INET6    26              /* Matches Solaris's AF_INET6 */
  27
  28 #ifdef DLT_IPNET
  29
  30 static const struct tok ipnet_values[] = {
  31         { IPH_AF_INET,          "IPv4" },
  32         { IPH_AF_INET6,         "IPv6" },
  33         { 0,                    NULL }
  34 };
  35
  36 static inline void
  37 ipnet_hdr_print(struct netdissect_options *ndo, const u_char *bp, u_int length)
  38 {
  39         const ipnet_hdr_t *hdr;
  40         hdr = (const ipnet_hdr_t *)bp;
  41
  42         ND_PRINT((ndo, "%d > %d", hdr->iph_zsrc, hdr->iph_zdst));
  43
  44         if (!ndo->ndo_qflag) {
  45                 ND_PRINT((ndo,", family %s (%d)",
  46                           tok2str(ipnet_values, "Unknown",
  47                                   hdr->iph_family),
  48                           hdr->iph_family));
  49         } else {
  50                 ND_PRINT((ndo,", %s",
  51                           tok2str(ipnet_values,
  52                                   "Unknown Ethertype (0x%04x)",
  53                                   hdr->iph_family)));
  54         }
  55
  56         ND_PRINT((ndo, ", length %u: ", length));
  57 }
  58
  59 static void
  60 ipnet_print(struct netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
  61 {
  62         ipnet_hdr_t *hdr;
  63
  64         if (caplen < sizeof(ipnet_hdr_t)) {
  65                 ND_PRINT((ndo, "[|ipnet]"));
  66                 return;
  67         }
  68
  69         if (ndo->ndo_eflag)
  70                 ipnet_hdr_print(ndo, p, length);
  71
  72         length -= sizeof(ipnet_hdr_t);
  73         caplen -= sizeof(ipnet_hdr_t);
  74         hdr = (ipnet_hdr_t *)p;
  75         p += sizeof(ipnet_hdr_t);
  76
  77         switch (hdr->iph_family) {
  78
  79         case IPH_AF_INET:
  80                 ip_print(ndo, p, length);
  81                 break;
  82
  83 #ifdef INET6
  84         case IPH_AF_INET6:
  85                 ip6_print(ndo, p, length);
  86                 break;
  87 #endif /*INET6*/
  88
  89         default:
  90                 if (!ndo->ndo_eflag)
  91                         ipnet_hdr_print(ndo, (u_char *)hdr,
  92                                         length + sizeof(ipnet_hdr_t));
  93
  94                 if (!ndo->ndo_suppress_default_print)
  95                         ndo->ndo_default_print(ndo, p, caplen);
  96                 break;
  97         }
  98 }
  99
 100 /*
 101  * This is the top level routine of the printer.  'p' points
 102  * to the ether header of the packet, 'h->ts' is the timestamp,
 103  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 104  * is the number of bytes actually captured.
 105  */
 106 u_int
 107 ipnet_if_print(struct netdissect_options *ndo,
 108                const struct pcap_pkthdr *h, const u_char *p)
 109 {
 110         ipnet_print(ndo, p, h->len, h->caplen);
 111
 112         return (sizeof(ipnet_hdr_t));
 113 }
 114
 115 /*
 116  * Local Variables:
 117  * c-style: whitesmith
 118  * c-basic-offset: 8
 119  * End:
 120  */
 121
 122 #endif /* DLT_IPNET */