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/* \summary: IP over Fibre Channel printer */
23
24/* specification: RFC 2625 */
25
26#ifdef HAVE_CONFIG_H
27#include <config.h>
28#endif
29
30#include "netdissect-stdinc.h"
31
32#include <string.h>
33
34#define ND_LONGJMP_FROM_TCHECK
35#include "netdissect.h"
36#include "addrtoname.h"
37
38
39struct ipfc_header {
40	nd_byte ipfc_dhost[2+MAC_ADDR_LEN];
41	nd_byte ipfc_shost[2+MAC_ADDR_LEN];
42};
43
44#define IPFC_HDRLEN 16
45
46/* Extract src, dst addresses */
47static void
48extract_ipfc_addrs(const struct ipfc_header *ipfcp, char *ipfcsrc,
49		   char *ipfcdst)
50{
51	/*
52	 * We assume that, as per RFC 2625, the lower 48 bits of the
53	 * source and destination addresses are MAC addresses.
54	 */
55	memcpy(ipfcdst, (const char *)&ipfcp->ipfc_dhost[2], MAC_ADDR_LEN);
56	memcpy(ipfcsrc, (const char *)&ipfcp->ipfc_shost[2], MAC_ADDR_LEN);
57}
58
59/*
60 * Print the Network_Header
61 */
62static void
63ipfc_hdr_print(netdissect_options *ndo,
64	       const struct ipfc_header *ipfcp _U_, u_int length,
65	       const u_char *ipfcsrc, const u_char *ipfcdst)
66{
67	const char *srcname, *dstname;
68
69	srcname = etheraddr_string(ndo, ipfcsrc);
70	dstname = etheraddr_string(ndo, ipfcdst);
71
72	/*
73	 * XXX - should we show the upper 16 bits of the addresses?
74	 * Do so only if "vflag" is set?
75	 * Section 3.3 "FC Port and Node Network Addresses" says that
76	 *
77	 *    In this specification, both the Source and Destination
78	 *    4-bit NAA identifiers SHALL be set to binary '0001'
79	 *    indicating that an IEEE 48-bit MAC address is contained
80	 *    in the lower 48 bits of the network address fields. The
81	 *    high order 12 bits in the network address fields SHALL
82	 *    be set to 0x0000.
83	 *
84	 * so, for captures following this specification, the upper 16
85	 * bits should be 0x1000, followed by a MAC address.
86	 */
87	ND_PRINT("%s > %s, length %u: ", srcname, dstname, length);
88}
89
90static u_int
91ipfc_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
92{
93	const struct ipfc_header *ipfcp = (const struct ipfc_header *)p;
94	nd_mac_addr srcmac, dstmac;
95	struct lladdr_info src, dst;
96	int llc_hdrlen;
97
98	ndo->ndo_protocol = "ipfc";
99	ND_TCHECK_LEN(p, IPFC_HDRLEN);
100	/*
101	 * Get the network addresses into a canonical form
102	 */
103	extract_ipfc_addrs(ipfcp, (char *)srcmac, (char *)dstmac);
104
105	if (ndo->ndo_eflag)
106		ipfc_hdr_print(ndo, ipfcp, length, srcmac, dstmac);
107
108	src.addr = srcmac;
109	src.addr_string = etheraddr_string;
110	dst.addr = dstmac;
111	dst.addr_string = etheraddr_string;
112
113	/* Skip over Network_Header */
114	length -= IPFC_HDRLEN;
115	p += IPFC_HDRLEN;
116	caplen -= IPFC_HDRLEN;
117
118	/* Try to print the LLC-layer header & higher layers */
119	llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst);
120	if (llc_hdrlen < 0) {
121		/*
122		 * Some kinds of LLC packet we cannot
123		 * handle intelligently
124		 */
125		if (!ndo->ndo_suppress_default_print)
126			ND_DEFAULTPRINT(p, caplen);
127		llc_hdrlen = -llc_hdrlen;
128	}
129	return (IPFC_HDRLEN + llc_hdrlen);
130}
131
132/*
133 * This is the top level routine of the printer.  'p' points
134 * to the Network_Header of the packet, 'h->ts' is the timestamp,
135 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
136 * is the number of bytes actually captured.
137 */
138void
139ipfc_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
140{
141	ndo->ndo_protocol = "ipfc";
142	ndo->ndo_ll_hdr_len += ipfc_print(ndo, p, h->len, h->caplen);
143}
144