The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) Arnaldo Carvalho de Melo 2004 |
| 3 | * Copyright (C) Ian McDonald 2005 |
| 4 | * Copyright (C) Yoshifumi Nishida 2005 |
| 5 | * |
| 6 | * This software may be distributed either under the terms of the |
| 7 | * BSD-style license that accompanies tcpdump or the GNU GPL version 2 |
| 8 | */ |
| 9 | |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 10 | #define NETDISSECT_REWORKED |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 11 | #ifdef HAVE_CONFIG_H |
| 12 | #include "config.h" |
| 13 | #endif |
| 14 | |
| 15 | #include <tcpdump-stdinc.h> |
| 16 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 17 | #include <stdio.h> |
| 18 | #include <string.h> |
| 19 | |
| 20 | #include "interface.h" |
| 21 | #include "addrtoname.h" |
| 22 | #include "extract.h" /* must come after interface.h */ |
| 23 | #include "ip.h" |
| 24 | #ifdef INET6 |
| 25 | #include "ip6.h" |
| 26 | #endif |
| 27 | #include "ipproto.h" |
| 28 | |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 29 | /* RFC4340: Datagram Congestion Control Protocol (DCCP) */ |
| 30 | |
| 31 | /** |
| 32 | * struct dccp_hdr - generic part of DCCP packet header, with a 24-bit |
| 33 | * sequence number |
| 34 | * |
| 35 | * @dccph_sport - Relevant port on the endpoint that sent this packet |
| 36 | * @dccph_dport - Relevant port on the other endpoint |
| 37 | * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words |
| 38 | * @dccph_ccval - Used by the HC-Sender CCID |
| 39 | * @dccph_cscov - Parts of the packet that are covered by the Checksum field |
| 40 | * @dccph_checksum - Internet checksum, depends on dccph_cscov |
| 41 | * @dccph_x - 0 = 24 bit sequence number, 1 = 48 |
| 42 | * @dccph_type - packet type, see DCCP_PKT_ prefixed macros |
| 43 | * @dccph_seq - 24-bit sequence number |
| 44 | */ |
| 45 | struct dccp_hdr { |
| 46 | uint16_t dccph_sport, |
| 47 | dccph_dport; |
| 48 | uint8_t dccph_doff; |
| 49 | uint8_t dccph_ccval_cscov; |
| 50 | uint16_t dccph_checksum; |
| 51 | uint8_t dccph_xtr; |
| 52 | uint8_t dccph_seq[3]; |
| 53 | } UNALIGNED; |
| 54 | |
| 55 | /** |
| 56 | * struct dccp_hdr_ext - generic part of DCCP packet header, with a 48-bit |
| 57 | * sequence number |
| 58 | * |
| 59 | * @dccph_sport - Relevant port on the endpoint that sent this packet |
| 60 | * @dccph_dport - Relevant port on the other endpoint |
| 61 | * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words |
| 62 | * @dccph_ccval - Used by the HC-Sender CCID |
| 63 | * @dccph_cscov - Parts of the packet that are covered by the Checksum field |
| 64 | * @dccph_checksum - Internet checksum, depends on dccph_cscov |
| 65 | * @dccph_x - 0 = 24 bit sequence number, 1 = 48 |
| 66 | * @dccph_type - packet type, see DCCP_PKT_ prefixed macros |
| 67 | * @dccph_seq - 48-bit sequence number |
| 68 | */ |
| 69 | struct dccp_hdr_ext { |
| 70 | uint16_t dccph_sport, |
| 71 | dccph_dport; |
| 72 | uint8_t dccph_doff; |
| 73 | uint8_t dccph_ccval_cscov; |
| 74 | uint16_t dccph_checksum; |
| 75 | uint8_t dccph_xtr; |
| 76 | uint8_t reserved; |
| 77 | uint8_t dccph_seq[6]; |
| 78 | } UNALIGNED; |
| 79 | |
| 80 | #define DCCPH_CCVAL(dh) (((dh)->dccph_ccval_cscov >> 4) & 0xF) |
| 81 | #define DCCPH_CSCOV(dh) (((dh)->dccph_ccval_cscov) & 0xF) |
| 82 | |
| 83 | #define DCCPH_X(dh) ((dh)->dccph_xtr & 1) |
| 84 | #define DCCPH_TYPE(dh) (((dh)->dccph_xtr >> 1) & 0xF) |
| 85 | |
| 86 | /** |
| 87 | * struct dccp_hdr_request - Conection initiation request header |
| 88 | * |
| 89 | * @dccph_req_service - Service to which the client app wants to connect |
| 90 | */ |
| 91 | struct dccp_hdr_request { |
| 92 | uint32_t dccph_req_service; |
| 93 | } UNALIGNED; |
| 94 | |
| 95 | /** |
| 96 | * struct dccp_hdr_response - Conection initiation response header |
| 97 | * |
| 98 | * @dccph_resp_ack - 48 bit ack number, contains GSR |
| 99 | * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request |
| 100 | */ |
| 101 | struct dccp_hdr_response { |
| 102 | uint8_t dccph_resp_ack[8]; /* always 8 bytes */ |
| 103 | uint32_t dccph_resp_service; |
| 104 | } UNALIGNED; |
| 105 | |
| 106 | /** |
| 107 | * struct dccp_hdr_reset - Unconditionally shut down a connection |
| 108 | * |
| 109 | * @dccph_resp_ack - 48 bit ack number |
| 110 | * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request |
| 111 | */ |
| 112 | struct dccp_hdr_reset { |
| 113 | uint8_t dccph_reset_ack[8]; /* always 8 bytes */ |
| 114 | uint8_t dccph_reset_code, |
| 115 | dccph_reset_data[3]; |
| 116 | } UNALIGNED; |
| 117 | |
| 118 | enum dccp_pkt_type { |
| 119 | DCCP_PKT_REQUEST = 0, |
| 120 | DCCP_PKT_RESPONSE, |
| 121 | DCCP_PKT_DATA, |
| 122 | DCCP_PKT_ACK, |
| 123 | DCCP_PKT_DATAACK, |
| 124 | DCCP_PKT_CLOSEREQ, |
| 125 | DCCP_PKT_CLOSE, |
| 126 | DCCP_PKT_RESET, |
| 127 | DCCP_PKT_SYNC, |
| 128 | DCCP_PKT_SYNCACK |
| 129 | }; |
| 130 | |
| 131 | static const struct tok dccp_pkt_type_str[] = { |
| 132 | { DCCP_PKT_REQUEST, "DCCP-Request" }, |
| 133 | { DCCP_PKT_RESPONSE, "DCCP-Response" }, |
| 134 | { DCCP_PKT_DATA, "DCCP-Data" }, |
| 135 | { DCCP_PKT_ACK, "DCCP-Ack" }, |
| 136 | { DCCP_PKT_DATAACK, "DCCP-DataAck" }, |
| 137 | { DCCP_PKT_CLOSEREQ, "DCCP-CloseReq" }, |
| 138 | { DCCP_PKT_CLOSE, "DCCP-Close" }, |
| 139 | { DCCP_PKT_RESET, "DCCP-Reset" }, |
| 140 | { DCCP_PKT_SYNC, "DCCP-Sync" }, |
| 141 | { DCCP_PKT_SYNCACK, "DCCP-SyncAck" }, |
| 142 | { 0, NULL} |
| 143 | }; |
| 144 | |
| 145 | enum dccp_reset_codes { |
| 146 | DCCP_RESET_CODE_UNSPECIFIED = 0, |
| 147 | DCCP_RESET_CODE_CLOSED, |
| 148 | DCCP_RESET_CODE_ABORTED, |
| 149 | DCCP_RESET_CODE_NO_CONNECTION, |
| 150 | DCCP_RESET_CODE_PACKET_ERROR, |
| 151 | DCCP_RESET_CODE_OPTION_ERROR, |
| 152 | DCCP_RESET_CODE_MANDATORY_ERROR, |
| 153 | DCCP_RESET_CODE_CONNECTION_REFUSED, |
| 154 | DCCP_RESET_CODE_BAD_SERVICE_CODE, |
| 155 | DCCP_RESET_CODE_TOO_BUSY, |
| 156 | DCCP_RESET_CODE_BAD_INIT_COOKIE, |
| 157 | DCCP_RESET_CODE_AGGRESSION_PENALTY, |
| 158 | __DCCP_RESET_CODE_LAST |
| 159 | }; |
| 160 | |
| 161 | static const char tstr[] = "[|dccp]"; |
| 162 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 163 | static const char *dccp_reset_codes[] = { |
| 164 | "unspecified", |
| 165 | "closed", |
| 166 | "aborted", |
| 167 | "no_connection", |
| 168 | "packet_error", |
| 169 | "option_error", |
| 170 | "mandatory_error", |
| 171 | "connection_refused", |
| 172 | "bad_service_code", |
| 173 | "too_busy", |
| 174 | "bad_init_cookie", |
| 175 | "aggression_penalty", |
| 176 | }; |
| 177 | |
| 178 | static const char *dccp_feature_nums[] = { |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 179 | "reserved", |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 180 | "ccid", |
| 181 | "allow_short_seqno", |
| 182 | "sequence_window", |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 183 | "ecn_incapable", |
| 184 | "ack_ratio", |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 185 | "send_ack_vector", |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 186 | "send_ndp_count", |
| 187 | "minimum checksum coverage", |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 188 | "check data checksum", |
| 189 | }; |
| 190 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 191 | static inline u_int dccp_csum_coverage(const struct dccp_hdr* dh, u_int len) |
| 192 | { |
| 193 | u_int cov; |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 194 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 195 | if (DCCPH_CSCOV(dh) == 0) |
| 196 | return len; |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 197 | cov = (dh->dccph_doff + DCCPH_CSCOV(dh) - 1) * sizeof(uint32_t); |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 198 | return (cov > len)? len : cov; |
| 199 | } |
| 200 | |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 201 | static int dccp_cksum(netdissect_options *ndo, const struct ip *ip, |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 202 | const struct dccp_hdr *dh, u_int len) |
| 203 | { |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 204 | return nextproto4_cksum(ndo, ip, (const uint8_t *)(void *)dh, len, |
| 205 | dccp_csum_coverage(dh, len), IPPROTO_DCCP); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 206 | } |
| 207 | |
| 208 | #ifdef INET6 |
| 209 | static int dccp6_cksum(const struct ip6_hdr *ip6, const struct dccp_hdr *dh, u_int len) |
| 210 | { |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 211 | return nextproto6_cksum(ip6, (const uint8_t *)(void *)dh, len, |
| 212 | dccp_csum_coverage(dh, len), IPPROTO_DCCP); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 213 | } |
| 214 | #endif |
| 215 | |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 216 | static const char *dccp_reset_code(uint8_t code) |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 217 | { |
| 218 | if (code >= __DCCP_RESET_CODE_LAST) |
| 219 | return "invalid"; |
| 220 | return dccp_reset_codes[code]; |
| 221 | } |
| 222 | |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 223 | static uint64_t dccp_seqno(const u_char *bp) |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 224 | { |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 225 | const struct dccp_hdr *dh = (const struct dccp_hdr *)bp; |
| 226 | uint64_t seqno; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 227 | |
| 228 | if (DCCPH_X(dh) != 0) { |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 229 | const struct dccp_hdr_ext *dhx = (const struct dccp_hdr_ext *)bp; |
| 230 | seqno = EXTRACT_48BITS(dhx->dccph_seq); |
| 231 | } else { |
| 232 | seqno = EXTRACT_24BITS(dh->dccph_seq); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 233 | } |
| 234 | |
| 235 | return seqno; |
| 236 | } |
| 237 | |
| 238 | static inline unsigned int dccp_basic_hdr_len(const struct dccp_hdr *dh) |
| 239 | { |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 240 | return DCCPH_X(dh) ? sizeof(struct dccp_hdr_ext) : sizeof(struct dccp_hdr); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 241 | } |
| 242 | |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 243 | static void dccp_print_ack_no(netdissect_options *ndo, const u_char *bp) |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 244 | { |
| 245 | const struct dccp_hdr *dh = (const struct dccp_hdr *)bp; |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 246 | const u_char *ackp = bp + dccp_basic_hdr_len(dh); |
| 247 | uint64_t ackno; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 248 | |
| 249 | if (DCCPH_X(dh) != 0) { |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 250 | ND_TCHECK2(*ackp, 8); |
| 251 | ackno = EXTRACT_48BITS(ackp + 2); |
| 252 | } else { |
| 253 | ND_TCHECK2(*ackp, 4); |
| 254 | ackno = EXTRACT_24BITS(ackp + 1); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 255 | } |
| 256 | |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 257 | ND_PRINT((ndo, "(ack=%" PRIu64 ") ", ackno)); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 258 | trunc: |
| 259 | return; |
| 260 | } |
| 261 | |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 262 | static int dccp_print_option(netdissect_options *, const u_char *, u_int); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 263 | |
| 264 | /** |
| 265 | * dccp_print - show dccp packet |
| 266 | * @bp - beginning of dccp packet |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 267 | * @data2 - beginning of enclosing |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 268 | * @len - lenght of ip packet |
| 269 | */ |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 270 | void dccp_print(netdissect_options *ndo, const u_char *bp, const u_char *data2, |
| 271 | u_int len) |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 272 | { |
| 273 | const struct dccp_hdr *dh; |
| 274 | const struct ip *ip; |
| 275 | #ifdef INET6 |
| 276 | const struct ip6_hdr *ip6; |
| 277 | #endif |
| 278 | const u_char *cp; |
| 279 | u_short sport, dport; |
| 280 | u_int hlen; |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 281 | u_int fixed_hdrlen; |
| 282 | uint8_t dccph_type; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 283 | |
| 284 | dh = (const struct dccp_hdr *)bp; |
| 285 | |
| 286 | ip = (struct ip *)data2; |
| 287 | #ifdef INET6 |
| 288 | if (IP_V(ip) == 6) |
| 289 | ip6 = (const struct ip6_hdr *)data2; |
| 290 | else |
| 291 | ip6 = NULL; |
| 292 | #endif /*INET6*/ |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 293 | |
| 294 | /* make sure we have enough data to look at the X bit */ |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 295 | cp = (const u_char *)(dh + 1); |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 296 | if (cp > ndo->ndo_snapend) { |
| 297 | ND_PRINT((ndo, "[Invalid packet|dccp]")); |
| 298 | return; |
| 299 | } |
| 300 | if (len < sizeof(struct dccp_hdr)) { |
| 301 | ND_PRINT((ndo, "truncated-dccp - %u bytes missing!", |
| 302 | len - (u_int)sizeof(struct dccp_hdr))); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 303 | return; |
| 304 | } |
| 305 | |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 306 | /* get the length of the generic header */ |
| 307 | fixed_hdrlen = dccp_basic_hdr_len(dh); |
| 308 | if (len < fixed_hdrlen) { |
| 309 | ND_PRINT((ndo, "truncated-dccp - %u bytes missing!", |
| 310 | len - fixed_hdrlen)); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 311 | return; |
| 312 | } |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 313 | ND_TCHECK2(*dh, fixed_hdrlen); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 314 | |
| 315 | sport = EXTRACT_16BITS(&dh->dccph_sport); |
| 316 | dport = EXTRACT_16BITS(&dh->dccph_dport); |
| 317 | hlen = dh->dccph_doff * 4; |
| 318 | |
| 319 | #ifdef INET6 |
| 320 | if (ip6) { |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 321 | ND_PRINT((ndo, "%s.%d > %s.%d: ", |
| 322 | ip6addr_string(ndo, &ip6->ip6_src), sport, |
| 323 | ip6addr_string(ndo, &ip6->ip6_dst), dport)); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 324 | } else |
| 325 | #endif /*INET6*/ |
| 326 | { |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 327 | ND_PRINT((ndo, "%s.%d > %s.%d: ", |
| 328 | ipaddr_string(ndo, &ip->ip_src), sport, |
| 329 | ipaddr_string(ndo, &ip->ip_dst), dport)); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 330 | } |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 331 | |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 332 | ND_PRINT((ndo, "DCCP")); |
| 333 | |
| 334 | if (ndo->ndo_qflag) { |
| 335 | ND_PRINT((ndo, " %d", len - hlen)); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 336 | if (hlen > len) { |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 337 | ND_PRINT((ndo, " [bad hdr length %u - too long, > %u]", |
| 338 | hlen, len)); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 339 | } |
| 340 | return; |
| 341 | } |
| 342 | |
| 343 | /* other variables in generic header */ |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 344 | if (ndo->ndo_vflag) { |
| 345 | ND_PRINT((ndo, " (CCVal %d, CsCov %d, ", DCCPH_CCVAL(dh), DCCPH_CSCOV(dh))); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 346 | } |
| 347 | |
| 348 | /* checksum calculation */ |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 349 | if (ndo->ndo_vflag && ND_TTEST2(bp[0], len)) { |
| 350 | uint16_t sum = 0, dccp_sum; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 351 | |
| 352 | dccp_sum = EXTRACT_16BITS(&dh->dccph_checksum); |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 353 | ND_PRINT((ndo, "cksum 0x%04x ", dccp_sum)); |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 354 | if (IP_V(ip) == 4) |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 355 | sum = dccp_cksum(ndo, ip, dh, len); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 356 | #ifdef INET6 |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 357 | else if (IP_V(ip) == 6) |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 358 | sum = dccp6_cksum(ip6, dh, len); |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 359 | #endif |
| 360 | if (sum != 0) |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 361 | ND_PRINT((ndo, "(incorrect -> 0x%04x)",in_cksum_shouldbe(dccp_sum, sum))); |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 362 | else |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 363 | ND_PRINT((ndo, "(correct)")); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 364 | } |
| 365 | |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 366 | if (ndo->ndo_vflag) |
| 367 | ND_PRINT((ndo, ")")); |
| 368 | ND_PRINT((ndo, " ")); |
| 369 | |
| 370 | dccph_type = DCCPH_TYPE(dh); |
| 371 | switch (dccph_type) { |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 372 | case DCCP_PKT_REQUEST: { |
| 373 | struct dccp_hdr_request *dhr = |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 374 | (struct dccp_hdr_request *)(bp + fixed_hdrlen); |
| 375 | fixed_hdrlen += 4; |
| 376 | if (len < fixed_hdrlen) { |
| 377 | ND_PRINT((ndo, "truncated-%s - %u bytes missing!", |
| 378 | tok2str(dccp_pkt_type_str, "", dccph_type), |
| 379 | len - fixed_hdrlen)); |
| 380 | return; |
| 381 | } |
| 382 | ND_TCHECK(*dhr); |
| 383 | ND_PRINT((ndo, "%s (service=%d) ", |
| 384 | tok2str(dccp_pkt_type_str, "", dccph_type), |
| 385 | EXTRACT_32BITS(&dhr->dccph_req_service))); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 386 | break; |
| 387 | } |
| 388 | case DCCP_PKT_RESPONSE: { |
| 389 | struct dccp_hdr_response *dhr = |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 390 | (struct dccp_hdr_response *)(bp + fixed_hdrlen); |
| 391 | fixed_hdrlen += 12; |
| 392 | if (len < fixed_hdrlen) { |
| 393 | ND_PRINT((ndo, "truncated-%s - %u bytes missing!", |
| 394 | tok2str(dccp_pkt_type_str, "", dccph_type), |
| 395 | len - fixed_hdrlen)); |
| 396 | return; |
| 397 | } |
| 398 | ND_TCHECK(*dhr); |
| 399 | ND_PRINT((ndo, "%s (service=%d) ", |
| 400 | tok2str(dccp_pkt_type_str, "", dccph_type), |
| 401 | EXTRACT_32BITS(&dhr->dccph_resp_service))); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 402 | break; |
| 403 | } |
| 404 | case DCCP_PKT_DATA: |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 405 | ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type))); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 406 | break; |
| 407 | case DCCP_PKT_ACK: { |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 408 | fixed_hdrlen += 8; |
| 409 | if (len < fixed_hdrlen) { |
| 410 | ND_PRINT((ndo, "truncated-%s - %u bytes missing!", |
| 411 | tok2str(dccp_pkt_type_str, "", dccph_type), |
| 412 | len - fixed_hdrlen)); |
| 413 | return; |
| 414 | } |
| 415 | ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type))); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 416 | break; |
| 417 | } |
| 418 | case DCCP_PKT_DATAACK: { |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 419 | fixed_hdrlen += 8; |
| 420 | if (len < fixed_hdrlen) { |
| 421 | ND_PRINT((ndo, "truncated-%s - %u bytes missing!", |
| 422 | tok2str(dccp_pkt_type_str, "", dccph_type), |
| 423 | len - fixed_hdrlen)); |
| 424 | return; |
| 425 | } |
| 426 | ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type))); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 427 | break; |
| 428 | } |
| 429 | case DCCP_PKT_CLOSEREQ: |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 430 | fixed_hdrlen += 8; |
| 431 | if (len < fixed_hdrlen) { |
| 432 | ND_PRINT((ndo, "truncated-%s - %u bytes missing!", |
| 433 | tok2str(dccp_pkt_type_str, "", dccph_type), |
| 434 | len - fixed_hdrlen)); |
| 435 | return; |
| 436 | } |
| 437 | ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type))); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 438 | break; |
| 439 | case DCCP_PKT_CLOSE: |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 440 | fixed_hdrlen += 8; |
| 441 | if (len < fixed_hdrlen) { |
| 442 | ND_PRINT((ndo, "truncated-%s - %u bytes missing!", |
| 443 | tok2str(dccp_pkt_type_str, "", dccph_type), |
| 444 | len - fixed_hdrlen)); |
| 445 | return; |
| 446 | } |
| 447 | ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type))); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 448 | break; |
| 449 | case DCCP_PKT_RESET: { |
| 450 | struct dccp_hdr_reset *dhr = |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 451 | (struct dccp_hdr_reset *)(bp + fixed_hdrlen); |
| 452 | fixed_hdrlen += 12; |
| 453 | if (len < fixed_hdrlen) { |
| 454 | ND_PRINT((ndo, "truncated-%s - %u bytes missing!", |
| 455 | tok2str(dccp_pkt_type_str, "", dccph_type), |
| 456 | len - fixed_hdrlen)); |
| 457 | return; |
| 458 | } |
| 459 | ND_TCHECK(*dhr); |
| 460 | ND_PRINT((ndo, "%s (code=%s) ", |
| 461 | tok2str(dccp_pkt_type_str, "", dccph_type), |
| 462 | dccp_reset_code(dhr->dccph_reset_code))); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 463 | break; |
| 464 | } |
| 465 | case DCCP_PKT_SYNC: |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 466 | fixed_hdrlen += 8; |
| 467 | if (len < fixed_hdrlen) { |
| 468 | ND_PRINT((ndo, "truncated-%s - %u bytes missing!", |
| 469 | tok2str(dccp_pkt_type_str, "", dccph_type), |
| 470 | len - fixed_hdrlen)); |
| 471 | return; |
| 472 | } |
| 473 | ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type))); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 474 | break; |
| 475 | case DCCP_PKT_SYNCACK: |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 476 | fixed_hdrlen += 8; |
| 477 | if (len < fixed_hdrlen) { |
| 478 | ND_PRINT((ndo, "truncated-%s - %u bytes missing!", |
| 479 | tok2str(dccp_pkt_type_str, "", dccph_type), |
| 480 | len - fixed_hdrlen)); |
| 481 | return; |
| 482 | } |
| 483 | ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type))); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 484 | break; |
| 485 | default: |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 486 | ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "unknown-type-%u", dccph_type))); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 487 | break; |
| 488 | } |
| 489 | |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 490 | if ((DCCPH_TYPE(dh) != DCCP_PKT_DATA) && |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 491 | (DCCPH_TYPE(dh) != DCCP_PKT_REQUEST)) |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 492 | dccp_print_ack_no(ndo, bp); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 493 | |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 494 | if (ndo->ndo_vflag < 2) |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 495 | return; |
| 496 | |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 497 | ND_PRINT((ndo, "seq %" PRIu64, dccp_seqno(bp))); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 498 | |
| 499 | /* process options */ |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 500 | if (hlen > fixed_hdrlen){ |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 501 | const u_char *cp; |
| 502 | u_int optlen; |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 503 | cp = bp + fixed_hdrlen; |
| 504 | ND_PRINT((ndo, " <")); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 505 | |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 506 | hlen -= fixed_hdrlen; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 507 | while(1){ |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 508 | optlen = dccp_print_option(ndo, cp, hlen); |
| 509 | if (!optlen) |
| 510 | break; |
| 511 | if (hlen <= optlen) |
| 512 | break; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 513 | hlen -= optlen; |
| 514 | cp += optlen; |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 515 | ND_PRINT((ndo, ", ")); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 516 | } |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 517 | ND_PRINT((ndo, ">")); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 518 | } |
| 519 | return; |
| 520 | trunc: |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 521 | ND_PRINT((ndo, "%s", tstr)); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 522 | return; |
| 523 | } |
| 524 | |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 525 | static const struct tok dccp_option_values[] = { |
| 526 | { 0, "nop" }, |
| 527 | { 1, "mandatory" }, |
| 528 | { 2, "slowreceiver" }, |
| 529 | { 32, "change_l" }, |
| 530 | { 33, "confirm_l" }, |
| 531 | { 34, "change_r" }, |
| 532 | { 35, "confirm_r" }, |
| 533 | { 36, "initcookie" }, |
| 534 | { 37, "ndp_count" }, |
| 535 | { 38, "ack_vector0" }, |
| 536 | { 39, "ack_vector1" }, |
| 537 | { 40, "data_dropped" }, |
| 538 | { 41, "timestamp" }, |
| 539 | { 42, "timestamp_echo" }, |
| 540 | { 43, "elapsed_time" }, |
| 541 | { 44, "data_checksum" }, |
| 542 | { 0, NULL } |
| 543 | }; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 544 | |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 545 | static int dccp_print_option(netdissect_options *ndo, const u_char *option, u_int hlen) |
| 546 | { |
| 547 | uint8_t optlen, i; |
| 548 | |
| 549 | ND_TCHECK(*option); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 550 | |
| 551 | if (*option >= 32) { |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 552 | ND_TCHECK(*(option+1)); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 553 | optlen = *(option +1); |
| 554 | if (optlen < 2) { |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 555 | if (*option >= 128) |
| 556 | ND_PRINT((ndo, "CCID option %u optlen too short", *option)); |
| 557 | else |
| 558 | ND_PRINT((ndo, "%s optlen too short", |
| 559 | tok2str(dccp_option_values, "Option %u", *option))); |
| 560 | return 0; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 561 | } |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 562 | } else |
| 563 | optlen = 1; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 564 | |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 565 | if (hlen < optlen) { |
| 566 | if (*option >= 128) |
| 567 | ND_PRINT((ndo, "CCID option %u optlen goes past header length", |
| 568 | *option)); |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 569 | else |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 570 | ND_PRINT((ndo, "%s optlen goes past header length", |
| 571 | tok2str(dccp_option_values, "Option %u", *option))); |
| 572 | return 0; |
| 573 | } |
| 574 | ND_TCHECK2(*option, optlen); |
| 575 | |
| 576 | if (*option >= 128) { |
| 577 | ND_PRINT((ndo, "CCID option %d", *option)); |
| 578 | switch (optlen) { |
| 579 | case 4: |
| 580 | ND_PRINT((ndo, " %u", EXTRACT_16BITS(option + 2))); |
| 581 | break; |
| 582 | case 6: |
| 583 | ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2))); |
| 584 | break; |
| 585 | default: |
| 586 | break; |
| 587 | } |
| 588 | } else { |
| 589 | ND_PRINT((ndo, "%s", tok2str(dccp_option_values, "Option %u", *option))); |
| 590 | switch (*option) { |
| 591 | case 32: |
| 592 | case 33: |
| 593 | case 34: |
| 594 | case 35: |
| 595 | if (optlen < 3) { |
| 596 | ND_PRINT((ndo, " optlen too short")); |
| 597 | return optlen; |
| 598 | } |
| 599 | if (*(option + 2) < 10){ |
| 600 | ND_PRINT((ndo, " %s", dccp_feature_nums[*(option + 2)])); |
| 601 | for (i = 0; i < optlen - 3; i++) |
| 602 | ND_PRINT((ndo, " %d", *(option + 3 + i))); |
| 603 | } |
| 604 | break; |
| 605 | case 36: |
| 606 | if (optlen > 2) { |
| 607 | ND_PRINT((ndo, " 0x")); |
| 608 | for (i = 0; i < optlen - 2; i++) |
| 609 | ND_PRINT((ndo, "%02x", *(option + 2 + i))); |
| 610 | } |
| 611 | break; |
| 612 | case 37: |
| 613 | for (i = 0; i < optlen - 2; i++) |
| 614 | ND_PRINT((ndo, " %d", *(option + 2 + i))); |
| 615 | break; |
| 616 | case 38: |
| 617 | if (optlen > 2) { |
| 618 | ND_PRINT((ndo, " 0x")); |
| 619 | for (i = 0; i < optlen - 2; i++) |
| 620 | ND_PRINT((ndo, "%02x", *(option + 2 + i))); |
| 621 | } |
| 622 | break; |
| 623 | case 39: |
| 624 | if (optlen > 2) { |
| 625 | ND_PRINT((ndo, " 0x")); |
| 626 | for (i = 0; i < optlen - 2; i++) |
| 627 | ND_PRINT((ndo, "%02x", *(option + 2 + i))); |
| 628 | } |
| 629 | break; |
| 630 | case 40: |
| 631 | if (optlen > 2) { |
| 632 | ND_PRINT((ndo, " 0x")); |
| 633 | for (i = 0; i < optlen - 2; i++) |
| 634 | ND_PRINT((ndo, "%02x", *(option + 2 + i))); |
| 635 | } |
| 636 | break; |
| 637 | case 41: |
| 638 | if (optlen == 4) |
| 639 | ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2))); |
| 640 | else |
| 641 | ND_PRINT((ndo, " optlen != 4")); |
| 642 | break; |
| 643 | case 42: |
| 644 | if (optlen == 4) |
| 645 | ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2))); |
| 646 | else |
| 647 | ND_PRINT((ndo, " optlen != 4")); |
| 648 | break; |
| 649 | case 43: |
| 650 | if (optlen == 6) |
| 651 | ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2))); |
| 652 | else if (optlen == 4) |
| 653 | ND_PRINT((ndo, " %u", EXTRACT_16BITS(option + 2))); |
| 654 | else |
| 655 | ND_PRINT((ndo, " optlen != 4 or 6")); |
| 656 | break; |
| 657 | case 44: |
| 658 | if (optlen > 2) { |
| 659 | ND_PRINT((ndo, " ")); |
| 660 | for (i = 0; i < optlen - 2; i++) |
| 661 | ND_PRINT((ndo, "%02x", *(option + 2 + i))); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 662 | } |
| 663 | break; |
| 664 | } |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 665 | } |
| 666 | |
| 667 | return optlen; |
| 668 | trunc: |
Elliott Hughes | 892a68b | 2015-10-19 14:43:53 -0700 | [diff] [blame] | 669 | ND_PRINT((ndo, "%s", tstr)); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 670 | return 0; |
| 671 | } |