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c8cf0f94 PA |
1 | /* |
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 | ||
411677ae | 22 | /* \summary: Compressed Serial Line Internet Protocol printer */ |
c8cf0f94 PA |
23 | |
24 | #ifdef HAVE_CONFIG_H | |
ed775ee7 | 25 | #include <config.h> |
c8cf0f94 PA |
26 | #endif |
27 | ||
ed775ee7 | 28 | #include "netdissect-stdinc.h" |
c8cf0f94 | 29 | |
ed775ee7 | 30 | #define ND_LONGJMP_FROM_TCHECK |
411677ae AL |
31 | #include "netdissect.h" |
32 | #include "extract.h" | |
c8cf0f94 PA |
33 | |
34 | #include "ip.h" | |
35 | #include "tcp.h" | |
c8cf0f94 PA |
36 | #include "slcompress.h" |
37 | ||
411677ae AL |
38 | /* |
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 | |
411677ae AL |
46 | |
47 | #define SLIPDIR_IN 0 | |
48 | #define SLIPDIR_OUT 1 | |
49 | ||
411677ae | 50 | |
c8cf0f94 PA |
51 | static u_int lastlen[2][256]; |
52 | static u_int lastconn = 255; | |
53 | ||
ed775ee7 AHJ |
54 | static void sliplink_print(netdissect_options *, const u_char *, const struct ip *, u_int); |
55 | static void compressed_sl_print(netdissect_options *, const u_char *, const struct ip *, u_int, int); | |
c8cf0f94 | 56 | |
ed775ee7 | 57 | void |
411677ae AL |
58 | sl_if_print(netdissect_options *ndo, |
59 | const struct pcap_pkthdr *h, const u_char *p) | |
c8cf0f94 | 60 | { |
ed775ee7 AHJ |
61 | u_int length = h->len; |
62 | const struct ip *ip; | |
c8cf0f94 | 63 | |
ed775ee7 AHJ |
64 | ndo->ndo_protocol = "slip"; |
65 | ND_TCHECK_LEN(p, SLIP_HDRLEN); | |
66 | ndo->ndo_ll_hdr_len += SLIP_HDRLEN; | |
c8cf0f94 PA |
67 | |
68 | length -= SLIP_HDRLEN; | |
69 | ||
411677ae AL |
70 | ip = (const struct ip *)(p + SLIP_HDRLEN); |
71 | ||
72 | if (ndo->ndo_eflag) | |
ed775ee7 | 73 | sliplink_print(ndo, p, ip, length); |
c8cf0f94 PA |
74 | |
75 | switch (IP_V(ip)) { | |
76 | case 4: | |
411677ae | 77 | ip_print(ndo, (const u_char *)ip, length); |
c8cf0f94 | 78 | break; |
c8cf0f94 | 79 | case 6: |
411677ae | 80 | ip6_print(ndo, (const u_char *)ip, length); |
c8cf0f94 | 81 | break; |
c8cf0f94 | 82 | default: |
ed775ee7 | 83 | ND_PRINT("ip v%u", IP_V(ip)); |
c8cf0f94 | 84 | } |
c8cf0f94 PA |
85 | } |
86 | ||
ed775ee7 | 87 | void |
411677ae AL |
88 | sl_bsdos_if_print(netdissect_options *ndo, |
89 | const struct pcap_pkthdr *h, const u_char *p) | |
c8cf0f94 | 90 | { |
ed775ee7 AHJ |
91 | u_int length = h->len; |
92 | const struct ip *ip; | |
c8cf0f94 | 93 | |
ed775ee7 AHJ |
94 | ndo->ndo_protocol = "slip_bsdos"; |
95 | ND_TCHECK_LEN(p, SLIP_HDRLEN); | |
96 | ndo->ndo_ll_hdr_len += SLIP_HDRLEN; | |
c8cf0f94 PA |
97 | |
98 | length -= SLIP_HDRLEN; | |
99 | ||
411677ae | 100 | ip = (const struct ip *)(p + SLIP_HDRLEN); |
c8cf0f94 PA |
101 | |
102 | #ifdef notdef | |
411677ae AL |
103 | if (ndo->ndo_eflag) |
104 | sliplink_print(ndo, p, ip, length); | |
c8cf0f94 PA |
105 | #endif |
106 | ||
411677ae | 107 | ip_print(ndo, (const u_char *)ip, length); |
c8cf0f94 PA |
108 | } |
109 | ||
ed775ee7 | 110 | static void |
411677ae | 111 | sliplink_print(netdissect_options *ndo, |
ed775ee7 AHJ |
112 | const u_char *p, const struct ip *ip, |
113 | u_int length) | |
c8cf0f94 PA |
114 | { |
115 | int dir; | |
116 | u_int hlen; | |
117 | ||
ed775ee7 | 118 | dir = GET_U_1(p + SLX_DIR); |
411677ae AL |
119 | switch (dir) { |
120 | ||
121 | case SLIPDIR_IN: | |
ed775ee7 | 122 | ND_PRINT("I "); |
411677ae | 123 | break; |
c8cf0f94 | 124 | |
411677ae | 125 | case SLIPDIR_OUT: |
ed775ee7 | 126 | ND_PRINT("O "); |
411677ae AL |
127 | break; |
128 | ||
129 | default: | |
ed775ee7 | 130 | ND_PRINT("Invalid direction %d ", dir); |
411677ae AL |
131 | dir = -1; |
132 | break; | |
133 | } | |
ed775ee7 | 134 | switch (GET_U_1(p + SLX_CHDR) & 0xf0) { |
c8cf0f94 PA |
135 | |
136 | case TYPE_IP: | |
ed775ee7 | 137 | ND_PRINT("ip %u: ", length + SLIP_HDRLEN); |
c8cf0f94 PA |
138 | 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 | */ | |
ed775ee7 AHJ |
146 | lastconn = GET_U_1(((const struct ip *)(p + SLX_CHDR))->ip_p); |
147 | ND_PRINT("utcp %u: ", lastconn); | |
411677ae AL |
148 | if (dir == -1) { |
149 | /* Direction is bogus, don't use it */ | |
ed775ee7 | 150 | return; |
411677ae | 151 | } |
ed775ee7 | 152 | ND_TCHECK_SIZE(ip); |
c8cf0f94 | 153 | hlen = IP_HL(ip); |
ed775ee7 | 154 | ND_TCHECK_SIZE((const struct tcphdr *)&((const int *)ip)[hlen]); |
411677ae | 155 | hlen += TH_OFF((const struct tcphdr *)&((const int *)ip)[hlen]); |
c8cf0f94 | 156 | lastlen[dir][lastconn] = length - (hlen << 2); |
c8cf0f94 PA |
157 | break; |
158 | ||
159 | default: | |
411677ae AL |
160 | if (dir == -1) { |
161 | /* Direction is bogus, don't use it */ | |
ed775ee7 | 162 | return; |
411677ae | 163 | } |
ed775ee7 AHJ |
164 | if (GET_U_1(p + SLX_CHDR) & TYPE_COMPRESSED_TCP) { |
165 | compressed_sl_print(ndo, p + SLX_CHDR, ip, length, dir); | |
166 | ND_PRINT(": "); | |
c8cf0f94 | 167 | } else |
ed775ee7 | 168 | ND_PRINT("slip-%u!: ", GET_U_1(p + SLX_CHDR)); |
c8cf0f94 PA |
169 | } |
170 | } | |
171 | ||
172 | static const u_char * | |
411677ae | 173 | print_sl_change(netdissect_options *ndo, |
ed775ee7 | 174 | const char *str, const u_char *cp) |
c8cf0f94 | 175 | { |
ed775ee7 | 176 | u_int i; |
c8cf0f94 | 177 | |
ed775ee7 AHJ |
178 | if ((i = GET_U_1(cp)) == 0) { |
179 | cp++; | |
180 | i = GET_BE_U_2(cp); | |
c8cf0f94 PA |
181 | cp += 2; |
182 | } | |
ed775ee7 | 183 | ND_PRINT(" %s%u", str, i); |
c8cf0f94 PA |
184 | return (cp); |
185 | } | |
186 | ||
187 | static const u_char * | |
411677ae | 188 | print_sl_winchange(netdissect_options *ndo, |
ed775ee7 | 189 | const u_char *cp) |
c8cf0f94 | 190 | { |
ed775ee7 | 191 | int16_t i; |
c8cf0f94 | 192 | |
ed775ee7 AHJ |
193 | if ((i = GET_U_1(cp)) == 0) { |
194 | cp++; | |
195 | i = GET_BE_S_2(cp); | |
c8cf0f94 PA |
196 | cp += 2; |
197 | } | |
198 | if (i >= 0) | |
ed775ee7 | 199 | ND_PRINT(" W+%d", i); |
c8cf0f94 | 200 | else |
ed775ee7 | 201 | ND_PRINT(" W%d", i); |
c8cf0f94 PA |
202 | return (cp); |
203 | } | |
204 | ||
ed775ee7 | 205 | static void |
411677ae AL |
206 | compressed_sl_print(netdissect_options *ndo, |
207 | const u_char *chdr, const struct ip *ip, | |
208 | u_int length, int dir) | |
c8cf0f94 | 209 | { |
ed775ee7 AHJ |
210 | const u_char *cp = chdr; |
211 | u_int flags, hlen; | |
c8cf0f94 | 212 | |
ed775ee7 AHJ |
213 | flags = GET_U_1(cp); |
214 | cp++; | |
c8cf0f94 | 215 | if (flags & NEW_C) { |
ed775ee7 AHJ |
216 | lastconn = GET_U_1(cp); |
217 | cp++; | |
218 | ND_PRINT("ctcp %u", lastconn); | |
c8cf0f94 | 219 | } else |
ed775ee7 | 220 | ND_PRINT("ctcp *"); |
c8cf0f94 PA |
221 | |
222 | /* skip tcp checksum */ | |
223 | cp += 2; | |
224 | ||
225 | switch (flags & SPECIALS_MASK) { | |
226 | case SPECIAL_I: | |
ed775ee7 | 227 | ND_PRINT(" *SA+%u", lastlen[dir][lastconn]); |
c8cf0f94 PA |
228 | break; |
229 | ||
230 | case SPECIAL_D: | |
ed775ee7 | 231 | ND_PRINT(" *S+%u", lastlen[dir][lastconn]); |
c8cf0f94 PA |
232 | break; |
233 | ||
234 | default: | |
235 | if (flags & NEW_U) | |
411677ae | 236 | cp = print_sl_change(ndo, "U=", cp); |
c8cf0f94 | 237 | if (flags & NEW_W) |
411677ae | 238 | cp = print_sl_winchange(ndo, cp); |
c8cf0f94 | 239 | if (flags & NEW_A) |
411677ae | 240 | cp = print_sl_change(ndo, "A+", cp); |
c8cf0f94 | 241 | if (flags & NEW_S) |
411677ae | 242 | cp = print_sl_change(ndo, "S+", cp); |
c8cf0f94 PA |
243 | break; |
244 | } | |
245 | if (flags & NEW_I) | |
411677ae | 246 | cp = print_sl_change(ndo, "I+", cp); |
c8cf0f94 PA |
247 | |
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 | */ | |
ed775ee7 | 253 | ND_TCHECK_SIZE(ip); |
c8cf0f94 | 254 | hlen = IP_HL(ip); |
ed775ee7 | 255 | ND_TCHECK_SIZE((const struct tcphdr *)&((const int32_t *)ip)[hlen]); |
411677ae | 256 | hlen += TH_OFF((const struct tcphdr *)&((const int32_t *)ip)[hlen]); |
c8cf0f94 | 257 | lastlen[dir][lastconn] = length - (hlen << 2); |
ed775ee7 | 258 | ND_PRINT(" %u (%ld)", lastlen[dir][lastconn], (long)(cp - chdr)); |
c8cf0f94 | 259 | } |