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 1.8 2024/09/02 16:15:31 christos Exp $");
25 #endif
26
27 /* \summary: IP over Fibre Channel printer */
28
29 /* specification: RFC 2625 */
30
31 #include <config.h>
32
33 #include "netdissect-stdinc.h"
34
35 #include <string.h>
36
37 #define ND_LONGJMP_FROM_TCHECK
38 #include "netdissect.h"
39 #include "addrtoname.h"
40
41
42 struct ipfc_header {
43 nd_byte ipfc_dhost[2+MAC_ADDR_LEN];
44 nd_byte ipfc_shost[2+MAC_ADDR_LEN];
45 };
46
47 #define IPFC_HDRLEN 16
48
49 /* Extract src, dst addresses */
50 static void
extract_ipfc_addrs(const struct ipfc_header * ipfcp,char * ipfcsrc,char * ipfcdst)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], MAC_ADDR_LEN);
59 memcpy(ipfcsrc, (const char *)&ipfcp->ipfc_shost[2], MAC_ADDR_LEN);
60 }
61
62 /*
63 * Print the Network_Header
64 */
65 static void
ipfc_hdr_print(netdissect_options * ndo,const struct ipfc_header * ipfcp _U_,u_int length,const u_char * ipfcsrc,const u_char * ipfcdst)66 ipfc_hdr_print(netdissect_options *ndo,
67 const struct ipfc_header *ipfcp _U_, u_int length,
68 const u_char *ipfcsrc, const u_char *ipfcdst)
69 {
70 const char *srcname, *dstname;
71
72 srcname = etheraddr_string(ndo, ipfcsrc);
73 dstname = etheraddr_string(ndo, ipfcdst);
74
75 /*
76 * XXX - should we show the upper 16 bits of the addresses?
77 * Do so only if "vflag" is set?
78 * Section 3.3 "FC Port and Node Network Addresses" says that
79 *
80 * In this specification, both the Source and Destination
81 * 4-bit NAA identifiers SHALL be set to binary '0001'
82 * indicating that an IEEE 48-bit MAC address is contained
83 * in the lower 48 bits of the network address fields. The
84 * high order 12 bits in the network address fields SHALL
85 * be set to 0x0000.
86 *
87 * so, for captures following this specification, the upper 16
88 * bits should be 0x1000, followed by a MAC address.
89 */
90 ND_PRINT("%s > %s, length %u: ", srcname, dstname, length);
91 }
92
93 static u_int
ipfc_print(netdissect_options * ndo,const u_char * p,u_int length,u_int caplen)94 ipfc_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
95 {
96 const struct ipfc_header *ipfcp = (const struct ipfc_header *)p;
97 nd_mac_addr srcmac, dstmac;
98 struct lladdr_info src, dst;
99 int llc_hdrlen;
100
101 ndo->ndo_protocol = "ipfc";
102 ND_TCHECK_LEN(p, IPFC_HDRLEN);
103 /*
104 * Get the network addresses into a canonical form
105 */
106 extract_ipfc_addrs(ipfcp, (char *)srcmac, (char *)dstmac);
107
108 if (ndo->ndo_eflag)
109 ipfc_hdr_print(ndo, ipfcp, length, srcmac, dstmac);
110
111 src.addr = srcmac;
112 src.addr_string = etheraddr_string;
113 dst.addr = dstmac;
114 dst.addr_string = etheraddr_string;
115
116 /* Skip over Network_Header */
117 length -= IPFC_HDRLEN;
118 p += IPFC_HDRLEN;
119 caplen -= IPFC_HDRLEN;
120
121 /* Try to print the LLC-layer header & higher layers */
122 llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst);
123 if (llc_hdrlen < 0) {
124 /*
125 * Some kinds of LLC packet we cannot
126 * handle intelligently
127 */
128 if (!ndo->ndo_suppress_default_print)
129 ND_DEFAULTPRINT(p, caplen);
130 llc_hdrlen = -llc_hdrlen;
131 }
132 return (IPFC_HDRLEN + llc_hdrlen);
133 }
134
135 /*
136 * This is the top level routine of the printer. 'p' points
137 * to the Network_Header of the packet, 'h->ts' is the timestamp,
138 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
139 * is the number of bytes actually captured.
140 */
141 void
ipfc_if_print(netdissect_options * ndo,const struct pcap_pkthdr * h,const u_char * p)142 ipfc_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
143 {
144 ndo->ndo_protocol = "ipfc";
145 ndo->ndo_ll_hdr_len += ipfc_print(ndo, p, h->len, h->caplen);
146 }
147