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[] =
  24     "@(#) $Header: /tcpdump/master/tcpdump/print-ipfc.c,v 1.2 2002-12-18 08:53:21 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 #include "ipfc.h"
  43
  44 /*
  45  * RFC 2625 IP-over-Fibre Channel.
  46  */
  47
  48 /* Extract src, dst addresses */
  49 static inline void
  50 extract_ipfc_addrs(const struct ipfc_header *ipfcp, char *ipfcsrc,
  51     char *ipfcdst)
  52 {
  53         /*
  54          * We assume that, as per RFC 2625, the lower 48 bits of the
  55          * source and destination addresses are MAC addresses.
  56          */
  57         memcpy(ipfcdst, (const char *)&ipfcp->ipfc_dhost[2], 6);
  58         memcpy(ipfcsrc, (const char *)&ipfcp->ipfc_shost[2], 6);
  59 }
  60
  61 /*
  62  * Print the Network_Header
  63  */
  64 static inline void
  65 ipfc_hdr_print(register const struct ipfc_header *ipfcp _U_,
  66            register u_int length, register const u_char *ipfcsrc,
  67            register const u_char *ipfcdst)
  68 {
  69         const char *srcname, *dstname;
  70
  71         srcname = etheraddr_string(ipfcsrc);
  72         dstname = etheraddr_string(ipfcdst);
  73
  74         /*
  75          * XXX - show the upper 16 bits?  Do so only if "vflag" is set?
  76          */
  77         (void) printf("%s %s %d: ", srcname, dstname, length);
  78 }
  79
  80 static void
  81 ipfc_print(const u_char *p, u_int length, u_int caplen)
  82 {
  83         const struct ipfc_header *ipfcp = (const struct ipfc_header *)p;
  84         struct ether_header ehdr;
  85         u_short extracted_ethertype;
  86
  87         if (caplen < IPFC_HDRLEN) {
  88                 printf("[|ipfc]");
  89                 return;
  90         }
  91         /*
  92          * Get the network addresses into a canonical form
  93          */
  94         extract_ipfc_addrs(ipfcp, (char *)ESRC(&ehdr), (char *)EDST(&ehdr));
  95
  96         /*
  97          * Some printers want to check that they're not walking off the
  98          * end of the packet.
  99          * Rather than pass it all the way down, we set this global.
 100          */
 101         snapend = p + caplen;
 102
 103         if (eflag)
 104                 ipfc_hdr_print(ipfcp, length, ESRC(&ehdr), EDST(&ehdr));
 105
 106         /* Skip over Network_Header */
 107         length -= IPFC_HDRLEN;
 108         p += IPFC_HDRLEN;
 109         caplen -= IPFC_HDRLEN;
 110
 111         /* Frame Control field determines interpretation of packet */
 112         extracted_ethertype = 0;
 113         /* Try to print the LLC-layer header & higher layers */
 114         if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
 115             &extracted_ethertype) == 0) {
 116                 /*
 117                  * Some kinds of LLC packet we cannot
 118                  * handle intelligently
 119                  */
 120                 if (!eflag)
 121                         ipfc_hdr_print(ipfcp, length + IPFC_HDRLEN,
 122                             ESRC(&ehdr), EDST(&ehdr));
 123                 if (extracted_ethertype) {
 124                         printf("(LLC %s) ",
 125                 etherproto_string(htons(extracted_ethertype)));
 126                 }
 127                 if (!xflag && !qflag)
 128                         default_print(p, caplen);
 129         }
 130 }
 131
 132 /*
 133  * This is the top level routine of the printer.  'sp' is the points
 134  * to the Network_Header of the packet, 'tvp' is the timestamp,
 135  * 'length' is the length of the packet off the wire, and 'caplen'
 136  * is the number of bytes actually captured.
 137  */
 138 void
 139 ipfc_if_print(u_char *pcap _U_, const struct pcap_pkthdr *h,
 140               register const u_char *p)
 141 {
 142         u_int caplen = h->caplen;
 143         u_int length = h->len;
 144
 145         ++infodelay;
 146         ts_print(&h->ts);
 147
 148         ipfc_print(p, length, caplen);
 149
 150         /*
 151          * If "-x" was specified, print stuff past the Network_Header,
 152          * if there's anything to print.
 153          */
 154         if (xflag && caplen > IPFC_HDRLEN)
 155                 default_print(p + IPFC_HDRLEN, caplen - IPFC_HDRLEN);
 156
 157         putchar('\n');
 158
 159         --infodelay;
 160         if (infoprint)
 161                 info(0);
 162 }