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
extract_ipfc_addrs(const struct ipfc_header * ipfcp,char * ipfcsrc,char * ipfcdst)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
ipfc_hdr_print(netdissect_options * ndo,register const struct ipfc_header * ipfcp _U_,register u_int length,register const u_char * ipfcsrc,register const u_char * ipfcdst)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
ipfc_print(netdissect_options * ndo,const u_char * p,u_int length,u_int caplen)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
ipfc_if_print(netdissect_options * ndo,const struct pcap_pkthdr * h,register const u_char * p)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 }
141