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 #include "netdissect.h"
35 #include "addrtoname.h"
36
37 #include "ether.h"
38
39 struct ipfc_header {
40 u_char ipfc_dhost[8];
41 u_char ipfc_shost[8];
42 };
43
44 #define IPFC_HDRLEN 16
45
46 /* Extract src, dst addresses */
47 static inline void
extract_ipfc_addrs(const struct ipfc_header * ipfcp,char * ipfcsrc,char * ipfcdst)48 extract_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], 6);
56 memcpy(ipfcsrc, (const char *)&ipfcp->ipfc_shost[2], 6);
57 }
58
59 /*
60 * Print the Network_Header
61 */
62 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)63 ipfc_hdr_print(netdissect_options *ndo,
64 register const struct ipfc_header *ipfcp _U_,
65 register u_int length, register const u_char *ipfcsrc,
66 register const u_char *ipfcdst)
67 {
68 const char *srcname, *dstname;
69
70 srcname = etheraddr_string(ndo, ipfcsrc);
71 dstname = etheraddr_string(ndo, ipfcdst);
72
73 /*
74 * XXX - should we show the upper 16 bits of the addresses?
75 * Do so only if "vflag" is set?
76 * Section 3.3 "FC Port and Node Network Addresses" says that
77 *
78 * In this specification, both the Source and Destination
79 * 4-bit NAA identifiers SHALL be set to binary '0001'
80 * indicating that an IEEE 48-bit MAC address is contained
81 * in the lower 48 bits of the network address fields. The
82 * high order 12 bits in the network address fields SHALL
83 * be set to 0x0000.
84 *
85 * so, for captures following this specification, the upper 16
86 * bits should be 0x1000, followed by a MAC address.
87 */
88 ND_PRINT((ndo, "%s > %s, length %u: ", srcname, dstname, length));
89 }
90
91 static u_int
ipfc_print(netdissect_options * ndo,const u_char * p,u_int length,u_int caplen)92 ipfc_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
93 {
94 const struct ipfc_header *ipfcp = (const struct ipfc_header *)p;
95 struct ether_header ehdr;
96 struct lladdr_info src, dst;
97 int llc_hdrlen;
98
99 if (caplen < IPFC_HDRLEN) {
100 ND_PRINT((ndo, "[|ipfc]"));
101 return (caplen);
102 }
103 /*
104 * Get the network addresses into a canonical form
105 */
106 extract_ipfc_addrs(ipfcp, (char *)ESRC(&ehdr), (char *)EDST(&ehdr));
107
108 if (ndo->ndo_eflag)
109 ipfc_hdr_print(ndo, ipfcp, length, ESRC(&ehdr), EDST(&ehdr));
110
111 src.addr = ESRC(&ehdr);
112 src.addr_string = etheraddr_string;
113 dst.addr = EDST(&ehdr);
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 u_int
ipfc_if_print(netdissect_options * ndo,const struct pcap_pkthdr * h,register const u_char * p)142 ipfc_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, register const u_char *p)
143 {
144 return (ipfc_print(ndo, p, h->len, h->caplen));
145 }
146