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

   1 /*
   2  * Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996, 1997
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21
  22 #ifndef lint
  23 static const char rcsid[] _U_ =
  24     "@(#) $Header: /tcpdump/master/tcpdump/print-ipfc.c,v 1.9 2005-11-13 12:12:42 guy Exp $ (LBL)";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <tcpdump-stdinc.h>
  32
  33 #include <pcap.h>
  34 #include <stdio.h>
  35 #include <string.h>
  36
  37 #include "interface.h"
  38 #include "addrtoname.h"
  39 #include "ethertype.h"
  40
  41 #include "ether.h"
  42
  43 /*
  44  * RFC 2625 IP-over-Fibre Channel.
  45  */
  46
  47 struct ipfc_header {
  48         u_char  ipfc_dhost[8];
  49         u_char  ipfc_shost[8];
  50 };
  51
  52 #define IPFC_HDRLEN 16
  53
  54 /* Extract src, dst addresses */
  55 static inline void
  56 extract_ipfc_addrs(const struct ipfc_header *ipfcp, char *ipfcsrc,
  57     char *ipfcdst)
  58 {
  59         /*
  60          * We assume that, as per RFC 2625, the lower 48 bits of the
  61          * source and destination addresses are MAC addresses.
  62          */
  63         memcpy(ipfcdst, (const char *)&ipfcp->ipfc_dhost[2], 6);
  64         memcpy(ipfcsrc, (const char *)&ipfcp->ipfc_shost[2], 6);
  65 }
  66
  67 /*
  68  * Print the Network_Header
  69  */
  70 static inline void
  71 ipfc_hdr_print(register const struct ipfc_header *ipfcp _U_,
  72            register u_int length, register const u_char *ipfcsrc,
  73            register const u_char *ipfcdst)
  74 {
  75         const char *srcname, *dstname;
  76
  77         srcname = etheraddr_string(ipfcsrc);
  78         dstname = etheraddr_string(ipfcdst);
  79
  80         /*
  81          * XXX - show the upper 16 bits?  Do so only if "vflag" is set?
  82          */
  83         (void) printf("%s %s %d: ", srcname, dstname, length);
  84 }
  85
  86 static void
  87 ipfc_print(const u_char *p, u_int length, u_int caplen)
  88 {
  89         const struct ipfc_header *ipfcp = (const struct ipfc_header *)p;
  90         struct ether_header ehdr;
  91         u_short extracted_ethertype;
  92
  93         if (caplen < IPFC_HDRLEN) {
  94                 printf("[|ipfc]");
  95                 return;
  96         }
  97         /*
  98          * Get the network addresses into a canonical form
  99          */
 100         extract_ipfc_addrs(ipfcp, (char *)ESRC(&ehdr), (char *)EDST(&ehdr));
 101
 102         if (eflag)
 103                 ipfc_hdr_print(ipfcp, length, ESRC(&ehdr), EDST(&ehdr));
 104
 105         /* Skip over Network_Header */
 106         length -= IPFC_HDRLEN;
 107         p += IPFC_HDRLEN;
 108         caplen -= IPFC_HDRLEN;
 109
 110         /* Try to print the LLC-layer header & higher layers */
 111         if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
 112             &extracted_ethertype) == 0) {
 113                 /*
 114                  * Some kinds of LLC packet we cannot
 115                  * handle intelligently
 116                  */
 117                 if (!eflag)
 118                         ipfc_hdr_print(ipfcp, length + IPFC_HDRLEN,
 119                             ESRC(&ehdr), EDST(&ehdr));
 120                 if (extracted_ethertype) {
 121                         printf("(LLC %s) ",
 122                 etherproto_string(htons(extracted_ethertype)));
 123                 }
 124                 if (!suppress_default_print)
 125                         default_print(p, caplen);
 126         }
 127 }
 128
 129 /*
 130  * This is the top level routine of the printer.  'p' points
 131  * to the Network_Header of the packet, 'h->ts' is the timestamp,
 132  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 133  * is the number of bytes actually captured.
 134  */
 135 u_int
 136 ipfc_if_print(const struct pcap_pkthdr *h, register const u_char *p)
 137 {
 138         ipfc_print(p, h->len, h->caplen);
 139
 140         return (IPFC_HDRLEN);
 141 }