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The Android Open Source Project2949f582009-03-03 19:30:46 -08001/*
2 * Copyright (c) 1989, 1990, 1991, 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
Elliott Hughese2e3bd12017-05-15 10:59:29 -070022/* \summary: Compressed Serial Line Internet Protocol printer */
23
The Android Open Source Project2949f582009-03-03 19:30:46 -080024#ifdef HAVE_CONFIG_H
Elliott Hughes820eced2021-08-20 18:00:50 -070025#include <config.h>
The Android Open Source Project2949f582009-03-03 19:30:46 -080026#endif
27
Elliott Hughes820eced2021-08-20 18:00:50 -070028#include "netdissect-stdinc.h"
The Android Open Source Project2949f582009-03-03 19:30:46 -080029
Elliott Hughes820eced2021-08-20 18:00:50 -070030#define ND_LONGJMP_FROM_TCHECK
Elliott Hughese2e3bd12017-05-15 10:59:29 -070031#include "netdissect.h"
32#include "extract.h"
The Android Open Source Project2949f582009-03-03 19:30:46 -080033
34#include "ip.h"
35#include "tcp.h"
The Android Open Source Project2949f582009-03-03 19:30:46 -080036#include "slcompress.h"
37
Elliott Hughes892a68b2015-10-19 14:43:53 -070038/*
39 * definitions of the pseudo- link-level header attached to slip
40 * packets grabbed by the packet filter (bpf) traffic monitor.
41 */
42#define SLIP_HDRLEN 16
43
44#define SLX_DIR 0
45#define SLX_CHDR 1
Elliott Hughes892a68b2015-10-19 14:43:53 -070046
47#define SLIPDIR_IN 0
48#define SLIPDIR_OUT 1
49
Elliott Hughes892a68b2015-10-19 14:43:53 -070050
The Android Open Source Project2949f582009-03-03 19:30:46 -080051static u_int lastlen[2][256];
52static u_int lastconn = 255;
53
Elliott Hughes892a68b2015-10-19 14:43:53 -070054static void sliplink_print(netdissect_options *, const u_char *, const struct ip *, u_int);
55static void compressed_sl_print(netdissect_options *, const u_char *, const struct ip *, u_int, int);
The Android Open Source Project2949f582009-03-03 19:30:46 -080056
Elliott Hughes820eced2021-08-20 18:00:50 -070057void
Elliott Hughes892a68b2015-10-19 14:43:53 -070058sl_if_print(netdissect_options *ndo,
59 const struct pcap_pkthdr *h, const u_char *p)
The Android Open Source Project2949f582009-03-03 19:30:46 -080060{
Elliott Hughes820eced2021-08-20 18:00:50 -070061 u_int length = h->len;
62 const struct ip *ip;
The Android Open Source Project2949f582009-03-03 19:30:46 -080063
Elliott Hughes820eced2021-08-20 18:00:50 -070064 ndo->ndo_protocol = "slip";
65 ND_TCHECK_LEN(p, SLIP_HDRLEN);
66 ndo->ndo_ll_hdr_len += SLIP_HDRLEN;
The Android Open Source Project2949f582009-03-03 19:30:46 -080067
68 length -= SLIP_HDRLEN;
69
Elliott Hughese2e3bd12017-05-15 10:59:29 -070070 ip = (const struct ip *)(p + SLIP_HDRLEN);
The Android Open Source Project2949f582009-03-03 19:30:46 -080071
Elliott Hughes892a68b2015-10-19 14:43:53 -070072 if (ndo->ndo_eflag)
73 sliplink_print(ndo, p, ip, length);
The Android Open Source Project2949f582009-03-03 19:30:46 -080074
75 switch (IP_V(ip)) {
76 case 4:
Elliott Hughese2e3bd12017-05-15 10:59:29 -070077 ip_print(ndo, (const u_char *)ip, length);
The Android Open Source Project2949f582009-03-03 19:30:46 -080078 break;
The Android Open Source Project2949f582009-03-03 19:30:46 -080079 case 6:
Elliott Hughese2e3bd12017-05-15 10:59:29 -070080 ip6_print(ndo, (const u_char *)ip, length);
The Android Open Source Project2949f582009-03-03 19:30:46 -080081 break;
The Android Open Source Project2949f582009-03-03 19:30:46 -080082 default:
Elliott Hughes820eced2021-08-20 18:00:50 -070083 ND_PRINT("ip v%u", IP_V(ip));
The Android Open Source Project2949f582009-03-03 19:30:46 -080084 }
The Android Open Source Project2949f582009-03-03 19:30:46 -080085}
86
Elliott Hughes820eced2021-08-20 18:00:50 -070087void
Elliott Hughes892a68b2015-10-19 14:43:53 -070088sl_bsdos_if_print(netdissect_options *ndo,
89 const struct pcap_pkthdr *h, const u_char *p)
The Android Open Source Project2949f582009-03-03 19:30:46 -080090{
Elliott Hughes820eced2021-08-20 18:00:50 -070091 u_int length = h->len;
92 const struct ip *ip;
The Android Open Source Project2949f582009-03-03 19:30:46 -080093
Elliott Hughes820eced2021-08-20 18:00:50 -070094 ndo->ndo_protocol = "slip_bsdos";
95 ND_TCHECK_LEN(p, SLIP_HDRLEN);
96 ndo->ndo_ll_hdr_len += SLIP_HDRLEN;
The Android Open Source Project2949f582009-03-03 19:30:46 -080097
98 length -= SLIP_HDRLEN;
99
Elliott Hughese2e3bd12017-05-15 10:59:29 -0700100 ip = (const struct ip *)(p + SLIP_HDRLEN);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800101
102#ifdef notdef
Elliott Hughes892a68b2015-10-19 14:43:53 -0700103 if (ndo->ndo_eflag)
104 sliplink_print(ndo, p, ip, length);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800105#endif
106
Elliott Hughese2e3bd12017-05-15 10:59:29 -0700107 ip_print(ndo, (const u_char *)ip, length);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800108}
109
110static void
Elliott Hughes892a68b2015-10-19 14:43:53 -0700111sliplink_print(netdissect_options *ndo,
Elliott Hughes820eced2021-08-20 18:00:50 -0700112 const u_char *p, const struct ip *ip,
113 u_int length)
The Android Open Source Project2949f582009-03-03 19:30:46 -0800114{
115 int dir;
116 u_int hlen;
117
Elliott Hughes820eced2021-08-20 18:00:50 -0700118 dir = GET_U_1(p + SLX_DIR);
Elliott Hughescec480a2017-12-19 16:54:57 -0800119 switch (dir) {
The Android Open Source Project2949f582009-03-03 19:30:46 -0800120
Elliott Hughescec480a2017-12-19 16:54:57 -0800121 case SLIPDIR_IN:
Elliott Hughes820eced2021-08-20 18:00:50 -0700122 ND_PRINT("I ");
Elliott Hughescec480a2017-12-19 16:54:57 -0800123 break;
124
125 case SLIPDIR_OUT:
Elliott Hughes820eced2021-08-20 18:00:50 -0700126 ND_PRINT("O ");
Elliott Hughescec480a2017-12-19 16:54:57 -0800127 break;
128
129 default:
Elliott Hughes820eced2021-08-20 18:00:50 -0700130 ND_PRINT("Invalid direction %d ", dir);
Elliott Hughescec480a2017-12-19 16:54:57 -0800131 dir = -1;
132 break;
133 }
Elliott Hughes820eced2021-08-20 18:00:50 -0700134 switch (GET_U_1(p + SLX_CHDR) & 0xf0) {
The Android Open Source Project2949f582009-03-03 19:30:46 -0800135
136 case TYPE_IP:
Elliott Hughes820eced2021-08-20 18:00:50 -0700137 ND_PRINT("ip %u: ", length + SLIP_HDRLEN);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800138 break;
139
140 case TYPE_UNCOMPRESSED_TCP:
141 /*
142 * The connection id is stored in the IP protocol field.
143 * Get it from the link layer since sl_uncompress_tcp()
144 * has restored the IP header copy to IPPROTO_TCP.
145 */
Elliott Hughes820eced2021-08-20 18:00:50 -0700146 lastconn = GET_U_1(((const struct ip *)(p + SLX_CHDR))->ip_p);
147 ND_PRINT("utcp %u: ", lastconn);
Elliott Hughescec480a2017-12-19 16:54:57 -0800148 if (dir == -1) {
149 /* Direction is bogus, don't use it */
150 return;
151 }
Elliott Hughes820eced2021-08-20 18:00:50 -0700152 ND_TCHECK_SIZE(ip);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800153 hlen = IP_HL(ip);
Elliott Hughes820eced2021-08-20 18:00:50 -0700154 ND_TCHECK_SIZE((const struct tcphdr *)&((const int *)ip)[hlen]);
Elliott Hughese2e3bd12017-05-15 10:59:29 -0700155 hlen += TH_OFF((const struct tcphdr *)&((const int *)ip)[hlen]);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800156 lastlen[dir][lastconn] = length - (hlen << 2);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800157 break;
158
159 default:
Elliott Hughescec480a2017-12-19 16:54:57 -0800160 if (dir == -1) {
161 /* Direction is bogus, don't use it */
162 return;
163 }
Elliott Hughes820eced2021-08-20 18:00:50 -0700164 if (GET_U_1(p + SLX_CHDR) & TYPE_COMPRESSED_TCP) {
165 compressed_sl_print(ndo, p + SLX_CHDR, ip, length, dir);
166 ND_PRINT(": ");
The Android Open Source Project2949f582009-03-03 19:30:46 -0800167 } else
Elliott Hughes820eced2021-08-20 18:00:50 -0700168 ND_PRINT("slip-%u!: ", GET_U_1(p + SLX_CHDR));
The Android Open Source Project2949f582009-03-03 19:30:46 -0800169 }
170}
171
172static const u_char *
Elliott Hughes892a68b2015-10-19 14:43:53 -0700173print_sl_change(netdissect_options *ndo,
Elliott Hughes820eced2021-08-20 18:00:50 -0700174 const char *str, const u_char *cp)
The Android Open Source Project2949f582009-03-03 19:30:46 -0800175{
Elliott Hughes820eced2021-08-20 18:00:50 -0700176 u_int i;
The Android Open Source Project2949f582009-03-03 19:30:46 -0800177
Elliott Hughes820eced2021-08-20 18:00:50 -0700178 if ((i = GET_U_1(cp)) == 0) {
179 cp++;
180 i = GET_BE_U_2(cp);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800181 cp += 2;
182 }
Elliott Hughes820eced2021-08-20 18:00:50 -0700183 ND_PRINT(" %s%u", str, i);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800184 return (cp);
185}
186
187static const u_char *
Elliott Hughes892a68b2015-10-19 14:43:53 -0700188print_sl_winchange(netdissect_options *ndo,
Elliott Hughes820eced2021-08-20 18:00:50 -0700189 const u_char *cp)
The Android Open Source Project2949f582009-03-03 19:30:46 -0800190{
Elliott Hughes820eced2021-08-20 18:00:50 -0700191 int16_t i;
The Android Open Source Project2949f582009-03-03 19:30:46 -0800192
Elliott Hughes820eced2021-08-20 18:00:50 -0700193 if ((i = GET_U_1(cp)) == 0) {
194 cp++;
195 i = GET_BE_S_2(cp);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800196 cp += 2;
197 }
198 if (i >= 0)
Elliott Hughes820eced2021-08-20 18:00:50 -0700199 ND_PRINT(" W+%d", i);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800200 else
Elliott Hughes820eced2021-08-20 18:00:50 -0700201 ND_PRINT(" W%d", i);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800202 return (cp);
203}
204
205static void
Elliott Hughes892a68b2015-10-19 14:43:53 -0700206compressed_sl_print(netdissect_options *ndo,
207 const u_char *chdr, const struct ip *ip,
208 u_int length, int dir)
The Android Open Source Project2949f582009-03-03 19:30:46 -0800209{
Elliott Hughes820eced2021-08-20 18:00:50 -0700210 const u_char *cp = chdr;
211 u_int flags, hlen;
The Android Open Source Project2949f582009-03-03 19:30:46 -0800212
Elliott Hughes820eced2021-08-20 18:00:50 -0700213 flags = GET_U_1(cp);
214 cp++;
The Android Open Source Project2949f582009-03-03 19:30:46 -0800215 if (flags & NEW_C) {
Elliott Hughes820eced2021-08-20 18:00:50 -0700216 lastconn = GET_U_1(cp);
217 cp++;
218 ND_PRINT("ctcp %u", lastconn);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800219 } else
Elliott Hughes820eced2021-08-20 18:00:50 -0700220 ND_PRINT("ctcp *");
The Android Open Source Project2949f582009-03-03 19:30:46 -0800221
222 /* skip tcp checksum */
223 cp += 2;
224
225 switch (flags & SPECIALS_MASK) {
226 case SPECIAL_I:
Elliott Hughes820eced2021-08-20 18:00:50 -0700227 ND_PRINT(" *SA+%u", lastlen[dir][lastconn]);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800228 break;
229
230 case SPECIAL_D:
Elliott Hughes820eced2021-08-20 18:00:50 -0700231 ND_PRINT(" *S+%u", lastlen[dir][lastconn]);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800232 break;
233
234 default:
235 if (flags & NEW_U)
Elliott Hughes892a68b2015-10-19 14:43:53 -0700236 cp = print_sl_change(ndo, "U=", cp);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800237 if (flags & NEW_W)
Elliott Hughes892a68b2015-10-19 14:43:53 -0700238 cp = print_sl_winchange(ndo, cp);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800239 if (flags & NEW_A)
Elliott Hughes892a68b2015-10-19 14:43:53 -0700240 cp = print_sl_change(ndo, "A+", cp);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800241 if (flags & NEW_S)
Elliott Hughes892a68b2015-10-19 14:43:53 -0700242 cp = print_sl_change(ndo, "S+", cp);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800243 break;
244 }
245 if (flags & NEW_I)
Elliott Hughes892a68b2015-10-19 14:43:53 -0700246 cp = print_sl_change(ndo, "I+", cp);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800247
248 /*
249 * 'hlen' is the length of the uncompressed TCP/IP header (in words).
250 * 'cp - chdr' is the length of the compressed header.
251 * 'length - hlen' is the amount of data in the packet.
252 */
Elliott Hughes820eced2021-08-20 18:00:50 -0700253 ND_TCHECK_SIZE(ip);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800254 hlen = IP_HL(ip);
Elliott Hughes820eced2021-08-20 18:00:50 -0700255 ND_TCHECK_SIZE((const struct tcphdr *)&((const int32_t *)ip)[hlen]);
Elliott Hughese2e3bd12017-05-15 10:59:29 -0700256 hlen += TH_OFF((const struct tcphdr *)&((const int32_t *)ip)[hlen]);
The Android Open Source Project2949f582009-03-03 19:30:46 -0800257 lastlen[dir][lastconn] = length - (hlen << 2);
Elliott Hughes820eced2021-08-20 18:00:50 -0700258 ND_PRINT(" %u (%ld)", lastlen[dir][lastconn], (long)(cp - chdr));
The Android Open Source Project2949f582009-03-03 19:30:46 -0800259}