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.
25 static const char rcsid[] =
26 "@(#) $Header: /tcpdump/master/tcpdump/print-sl.c,v 1.56 2000/10/10 05:06:10 guy Exp $ (LBL)";
33 #include <sys/param.h>
36 #include <netinet/in.h>
43 #include "interface.h"
44 #include "addrtoname.h"
45 #include "extract.h" /* must come after interface.h */
50 #include "slcompress.h"
52 static u_int lastlen[2][256];
53 static u_int lastconn = 255;
55 static void sliplink_print(const u_char *, const struct ip *, u_int);
56 static void compressed_sl_print(const u_char *, const struct ip *, u_int, int);
59 sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
61 register u_int caplen = h->caplen;
62 register u_int length = h->len;
63 register const struct ip *ip;
67 if (caplen < SLIP_HDRLEN) {
72 * Some printers want to get back at the link level addresses,
73 * and/or check that they're not walking off the end of the packet.
74 * Rather than pass them all the way down, we set these globals.
79 length -= SLIP_HDRLEN;
81 ip = (struct ip *)(p + SLIP_HDRLEN);
84 sliplink_print(p, ip, length);
88 ip_print((u_char *)ip, length);
92 ip6_print((u_char *)ip, length);
96 printf ("ip v%d", IP_V(ip));
100 default_print((u_char *)ip, caplen - SLIP_HDRLEN);
107 sl_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
109 register u_int caplen = h->caplen;
110 register u_int length = h->len;
111 register const struct ip *ip;
115 if (caplen < SLIP_HDRLEN) {
120 * Some printers want to get back at the link level addresses,
121 * and/or check that they're not walking off the end of the packet.
122 * Rather than pass them all the way down, we set these globals.
125 snapend = p + caplen;
127 length -= SLIP_HDRLEN;
129 ip = (struct ip *)(p + SLIP_HDRLEN);
133 sliplink_print(p, ip, length);
136 ip_print((u_char *)ip, length);
139 default_print((u_char *)ip, caplen - SLIP_HDRLEN);
145 sliplink_print(register const u_char *p, register const struct ip *ip,
146 register u_int length)
152 putchar(dir == SLIPDIR_IN ? 'I' : 'O');
156 /* XXX just dump the header */
159 for (i = SLX_CHDR; i < SLX_CHDR + CHDR_LEN - 1; ++i)
160 printf("%02x.", p[i]);
161 printf("%02x: ", p[SLX_CHDR + CHDR_LEN - 1]);
164 switch (p[SLX_CHDR] & 0xf0) {
167 printf("ip %d: ", length + SLIP_HDRLEN);
170 case TYPE_UNCOMPRESSED_TCP:
172 * The connection id is stored in the IP protocol field.
173 * Get it from the link layer since sl_uncompress_tcp()
174 * has restored the IP header copy to IPPROTO_TCP.
176 lastconn = ((struct ip *)&p[SLX_CHDR])->ip_p;
178 hlen += TH_OFF((struct tcphdr *)&((int *)ip)[hlen]);
179 lastlen[dir][lastconn] = length - (hlen << 2);
180 printf("utcp %d: ", lastconn);
184 if (p[SLX_CHDR] & TYPE_COMPRESSED_TCP) {
185 compressed_sl_print(&p[SLX_CHDR], ip,
189 printf("slip-%d!: ", p[SLX_CHDR]);
193 static const u_char *
194 print_sl_change(const char *str, register const u_char *cp)
198 if ((i = *cp++) == 0) {
199 i = EXTRACT_16BITS(cp);
202 printf(" %s%d", str, i);
206 static const u_char *
207 print_sl_winchange(register const u_char *cp)
211 if ((i = *cp++) == 0) {
212 i = EXTRACT_16BITS(cp);
223 compressed_sl_print(const u_char *chdr, const struct ip *ip,
224 u_int length, int dir)
226 register const u_char *cp = chdr;
227 register u_int flags, hlen;
232 printf("ctcp %d", lastconn);
236 /* skip tcp checksum */
239 switch (flags & SPECIALS_MASK) {
241 printf(" *SA+%d", lastlen[dir][lastconn]);
245 printf(" *S+%d", lastlen[dir][lastconn]);
250 cp = print_sl_change("U=", cp);
252 cp = print_sl_winchange(cp);
254 cp = print_sl_change("A+", cp);
256 cp = print_sl_change("S+", cp);
260 cp = print_sl_change("I+", cp);
263 * 'hlen' is the length of the uncompressed TCP/IP header (in words).
264 * 'cp - chdr' is the length of the compressed header.
265 * 'length - hlen' is the amount of data in the packet.
268 hlen += TH_OFF((struct tcphdr *)&((int32_t *)ip)[hlen]);
269 lastlen[dir][lastconn] = length - (hlen << 2);
270 printf(" %d (%ld)", lastlen[dir][lastconn], (long)(cp - chdr));