external/bsd/tcpdump/dist/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 #include <sys/cdefs.h>
  23 #ifndef lint
  24 __RCSID("$NetBSD: print-ipfc.c,v 1.4 2014/11/20 03:05:03 christos Exp $");
  25 #endif
  26
  27 #define NETDISSECT_REWORKED
  28 #ifdef HAVE_CONFIG_H
  29 #include "config.h"
  30 #endif
  31
  32 #include <tcpdump-stdinc.h>
  33
  34 #include <string.h>
  35
  36 #include "interface.h"
  37 #include "addrtoname.h"
  38
  39 #include "ether.h"
  40
  41 /*
  42  * RFC 2625 IP-over-Fibre Channel.
  43  */
  44
  45 struct ipfc_header {
  46         u_char  ipfc_dhost[8];
  47         u_char  ipfc_shost[8];
  48 };
  49
  50 #define IPFC_HDRLEN 16
  51
  52 /* Extract src, dst addresses */
  53 static inline void
  54 extract_ipfc_addrs(const struct ipfc_header *ipfcp, char *ipfcsrc,
  55     char *ipfcdst)
  56 {
  57         /*
  58          * We assume that, as per RFC 2625, the lower 48 bits of the
  59          * source and destination addresses are MAC addresses.
  60          */
  61         memcpy(ipfcdst, (const char *)&ipfcp->ipfc_dhost[2], 6);
  62         memcpy(ipfcsrc, (const char *)&ipfcp->ipfc_shost[2], 6);
  63 }
  64
  65 /*
  66  * Print the Network_Header
  67  */
  68 static inline void
  69 ipfc_hdr_print(netdissect_options *ndo,
  70            register const struct ipfc_header *ipfcp _U_,
  71            register u_int length, register const u_char *ipfcsrc,
  72            register const u_char *ipfcdst)
  73 {
  74         const char *srcname, *dstname;
  75
  76         srcname = etheraddr_string(ndo, ipfcsrc);
  77         dstname = etheraddr_string(ndo, ipfcdst);
  78
  79         /*
  80          * XXX - show the upper 16 bits?  Do so only if "vflag" is set?
  81          */
  82         ND_PRINT((ndo, "%s %s %d: ", srcname, dstname, length));
  83 }
  84
  85 static void
  86 ipfc_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
  87 {
  88         const struct ipfc_header *ipfcp = (const struct ipfc_header *)p;
  89         struct ether_header ehdr;
  90         u_short extracted_ethertype;
  91
  92         if (caplen < IPFC_HDRLEN) {
  93                 ND_PRINT((ndo, "[|ipfc]"));
  94                 return;
  95         }
  96         /*
  97          * Get the network addresses into a canonical form
  98          */
  99         extract_ipfc_addrs(ipfcp, (char *)ESRC(&ehdr), (char *)EDST(&ehdr));
 100
 101         if (ndo->ndo_eflag)
 102                 ipfc_hdr_print(ndo, ipfcp, length, ESRC(&ehdr), EDST(&ehdr));
 103
 104         /* Skip over Network_Header */
 105         length -= IPFC_HDRLEN;
 106         p += IPFC_HDRLEN;
 107         caplen -= IPFC_HDRLEN;
 108
 109         /* Try to print the LLC-layer header & higher layers */
 110         if (llc_print(ndo, p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
 111             &extracted_ethertype) == 0) {
 112                 /*
 113                  * Some kinds of LLC packet we cannot
 114                  * handle intelligently
 115                  */
 116                 if (!ndo->ndo_eflag)
 117                         ipfc_hdr_print(ndo, ipfcp, length + IPFC_HDRLEN,
 118                             ESRC(&ehdr), EDST(&ehdr));
 119                 if (extracted_ethertype) {
 120                         ND_PRINT((ndo, "(LLC %s) ",
 121                 etherproto_string(htons(extracted_ethertype))));
 122                 }
 123                 if (!ndo->ndo_suppress_default_print)
 124                         ND_DEFAULTPRINT(p, caplen);
 125         }
 126 }
 127
 128 /*
 129  * This is the top level routine of the printer.  'p' points
 130  * to the Network_Header of the packet, 'h->ts' is the timestamp,
 131  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 132  * is the number of bytes actually captured.
 133  */
 134 u_int
 135 ipfc_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, register const u_char *p)
 136 {
 137         ipfc_print(ndo, p, h->len, h->caplen);
 138
 139         return (IPFC_HDRLEN);
 140 }