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 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include <tcpdump-stdinc.h>
  27
  28 #include <pcap.h>
  29 #include <stdio.h>
  30 #include <string.h>
  31
  32 #include "interface.h"
  33 #include "addrtoname.h"
  34 #include "ethertype.h"
  35
  36 #include "ether.h"
  37
  38 /*
  39  * RFC 2625 IP-over-Fibre Channel.
  40  */
  41
  42 struct ipfc_header {
  43         u_char  ipfc_dhost[8];
  44         u_char  ipfc_shost[8];
  45 };
  46
  47 #define IPFC_HDRLEN 16
  48
  49 /* Extract src, dst addresses */
  50 static inline void
  51 extract_ipfc_addrs(const struct ipfc_header *ipfcp, char *ipfcsrc,
  52     char *ipfcdst)
  53 {
  54         /*
  55          * We assume that, as per RFC 2625, the lower 48 bits of the
  56          * source and destination addresses are MAC addresses.
  57          */
  58         memcpy(ipfcdst, (const char *)&ipfcp->ipfc_dhost[2], 6);
  59         memcpy(ipfcsrc, (const char *)&ipfcp->ipfc_shost[2], 6);
  60 }
  61
  62 /*
  63  * Print the Network_Header
  64  */
  65 static inline void
  66 ipfc_hdr_print(register const struct ipfc_header *ipfcp _U_,
  67            register u_int length, register const u_char *ipfcsrc,
  68            register const u_char *ipfcdst)
  69 {
  70         const char *srcname, *dstname;
  71
  72         srcname = etheraddr_string(ipfcsrc);
  73         dstname = etheraddr_string(ipfcdst);
  74
  75         /*
  76          * XXX - show the upper 16 bits?  Do so only if "vflag" is set?
  77          */
  78         (void) printf("%s %s %d: ", srcname, dstname, length);
  79 }
  80
  81 static void
  82 ipfc_print(const u_char *p, u_int length, u_int caplen)
  83 {
  84         const struct ipfc_header *ipfcp = (const struct ipfc_header *)p;
  85         struct ether_header ehdr;
  86         u_short extracted_ethertype;
  87
  88         if (caplen < IPFC_HDRLEN) {
  89                 printf("[|ipfc]");
  90                 return;
  91         }
  92         /*
  93          * Get the network addresses into a canonical form
  94          */
  95         extract_ipfc_addrs(ipfcp, (char *)ESRC(&ehdr), (char *)EDST(&ehdr));
  96
  97         if (eflag)
  98                 ipfc_hdr_print(ipfcp, length, ESRC(&ehdr), EDST(&ehdr));
  99
 100         /* Skip over Network_Header */
 101         length -= IPFC_HDRLEN;
 102         p += IPFC_HDRLEN;
 103         caplen -= IPFC_HDRLEN;
 104
 105         /* Try to print the LLC-layer header & higher layers */
 106         if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
 107             &extracted_ethertype) == 0) {
 108                 /*
 109                  * Some kinds of LLC packet we cannot
 110                  * handle intelligently
 111                  */
 112                 if (!eflag)
 113                         ipfc_hdr_print(ipfcp, length + IPFC_HDRLEN,
 114                             ESRC(&ehdr), EDST(&ehdr));
 115                 if (extracted_ethertype) {
 116                         printf("(LLC %s) ",
 117                 etherproto_string(htons(extracted_ethertype)));
 118                 }
 119                 if (!suppress_default_print)
 120                         default_print(p, caplen);
 121         }
 122 }
 123
 124 /*
 125  * This is the top level routine of the printer.  'p' points
 126  * to the Network_Header of the packet, 'h->ts' is the timestamp,
 127  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 128  * is the number of bytes actually captured.
 129  */
 130 u_int
 131 ipfc_if_print(const struct pcap_pkthdr *h, register const u_char *p)
 132 {
 133         ipfc_print(p, h->len, h->caplen);
 134
 135         return (IPFC_HDRLEN);
 136 }