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