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