2 * Copyright (c) 1989, 1990, 1991, 1993, 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
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
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.
24 #define NETDISSECT_REWORKED
29 #include <tcpdump-stdinc.h>
31 #include "interface.h"
32 #include "extract.h" /* must come after interface.h */
36 #include "slcompress.h"
39 * definitions of the pseudo- link-level header attached to slip
40 * packets grabbed by the packet filter (bpf) traffic monitor.
42 #define SLIP_HDRLEN 16
51 static const char tstr[] = "[|slip]";
53 static u_int lastlen[2][256];
54 static u_int lastconn = 255;
56 static void sliplink_print(netdissect_options *, const u_char *, const struct ip *, u_int);
57 static void compressed_sl_print(netdissect_options *, const u_char *, const struct ip *, u_int, int);
60 sl_if_print(netdissect_options *ndo,
61 const struct pcap_pkthdr *h, const u_char *p)
63 register u_int caplen = h->caplen;
64 register u_int length = h->len;
65 register const struct ip *ip;
67 if (caplen < SLIP_HDRLEN || length < SLIP_HDRLEN) {
68 ND_PRINT((ndo, "%s", tstr));
72 length -= SLIP_HDRLEN;
74 ip = (struct ip *)(p + SLIP_HDRLEN);
77 sliplink_print(ndo, p, ip, length);
81 ip_print(ndo, (u_char *)ip, length);
84 ip6_print(ndo, (u_char *)ip, length);
87 ND_PRINT((ndo, "ip v%d", IP_V(ip)));
94 sl_bsdos_if_print(netdissect_options *ndo,
95 const struct pcap_pkthdr *h, const u_char *p)
97 register u_int caplen = h->caplen;
98 register u_int length = h->len;
99 register const struct ip *ip;
101 if (caplen < SLIP_HDRLEN) {
102 ND_PRINT((ndo, "%s", tstr));
106 length -= SLIP_HDRLEN;
108 ip = (struct ip *)(p + SLIP_HDRLEN);
112 sliplink_print(ndo, p, ip, length);
115 ip_print(ndo, (u_char *)ip, length);
117 return (SLIP_HDRLEN);
121 sliplink_print(netdissect_options *ndo,
122 register const u_char *p, register const struct ip *ip,
123 register u_int length)
129 ND_PRINT((ndo, dir == SLIPDIR_IN ? "I " : "O "));
131 if (ndo->ndo_nflag) {
132 /* XXX just dump the header */
135 for (i = SLX_CHDR; i < SLX_CHDR + CHDR_LEN - 1; ++i)
136 ND_PRINT((ndo, "%02x.", p[i]));
137 ND_PRINT((ndo, "%02x: ", p[SLX_CHDR + CHDR_LEN - 1]));
140 switch (p[SLX_CHDR] & 0xf0) {
143 ND_PRINT((ndo, "ip %d: ", length + SLIP_HDRLEN));
146 case TYPE_UNCOMPRESSED_TCP:
148 * The connection id is stored in the IP protocol field.
149 * Get it from the link layer since sl_uncompress_tcp()
150 * has restored the IP header copy to IPPROTO_TCP.
152 lastconn = ((struct ip *)&p[SLX_CHDR])->ip_p;
154 hlen += TH_OFF((struct tcphdr *)&((int *)ip)[hlen]);
155 lastlen[dir][lastconn] = length - (hlen << 2);
156 ND_PRINT((ndo, "utcp %d: ", lastconn));
160 if (p[SLX_CHDR] & TYPE_COMPRESSED_TCP) {
161 compressed_sl_print(ndo, &p[SLX_CHDR], ip,
163 ND_PRINT((ndo, ": "));
165 ND_PRINT((ndo, "slip-%d!: ", p[SLX_CHDR]));
169 static const u_char *
170 print_sl_change(netdissect_options *ndo,
171 const char *str, register const u_char *cp)
175 if ((i = *cp++) == 0) {
176 i = EXTRACT_16BITS(cp);
179 ND_PRINT((ndo, " %s%d", str, i));
183 static const u_char *
184 print_sl_winchange(netdissect_options *ndo,
185 register const u_char *cp)
189 if ((i = *cp++) == 0) {
190 i = EXTRACT_16BITS(cp);
194 ND_PRINT((ndo, " W+%d", i));
196 ND_PRINT((ndo, " W%d", i));
201 compressed_sl_print(netdissect_options *ndo,
202 const u_char *chdr, const struct ip *ip,
203 u_int length, int dir)
205 register const u_char *cp = chdr;
206 register u_int flags, hlen;
211 ND_PRINT((ndo, "ctcp %d", lastconn));
213 ND_PRINT((ndo, "ctcp *"));
215 /* skip tcp checksum */
218 switch (flags & SPECIALS_MASK) {
220 ND_PRINT((ndo, " *SA+%d", lastlen[dir][lastconn]));
224 ND_PRINT((ndo, " *S+%d", lastlen[dir][lastconn]));
229 cp = print_sl_change(ndo, "U=", cp);
231 cp = print_sl_winchange(ndo, cp);
233 cp = print_sl_change(ndo, "A+", cp);
235 cp = print_sl_change(ndo, "S+", cp);
239 cp = print_sl_change(ndo, "I+", cp);
242 * 'hlen' is the length of the uncompressed TCP/IP header (in words).
243 * 'cp - chdr' is the length of the compressed header.
244 * 'length - hlen' is the amount of data in the packet.
247 hlen += TH_OFF((struct tcphdr *)&((int32_t *)ip)[hlen]);
248 lastlen[dir][lastconn] = length - (hlen << 2);
249 ND_PRINT((ndo, " %d (%ld)", lastlen[dir][lastconn], (long)(cp - chdr)));