JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 1 | /** |
| 2 | * Copyright (c) 2012 |
| 3 | * |
| 4 | * Gregory Detal <gregory.detal@uclouvain.be> |
| 5 | * Christoph Paasch <christoph.paasch@uclouvain.be> |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * |
| 18 | * 3. Neither the name of the University nor of the Laboratory may be used |
| 19 | * to endorse or promote products derived from this software without |
| 20 | * specific prior written permission. |
| 21 | * |
| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 32 | * SUCH DAMAGE. |
| 33 | */ |
| 34 | |
| 35 | #ifdef HAVE_CONFIG_H |
| 36 | #include "config.h" |
| 37 | #endif |
| 38 | |
| 39 | #include <tcpdump-stdinc.h> |
| 40 | |
| 41 | #include <stdio.h> |
| 42 | #include <string.h> |
| 43 | |
| 44 | #include "interface.h" |
| 45 | #include "extract.h" |
| 46 | #include "addrtoname.h" |
| 47 | |
| 48 | #include "ipproto.h" |
| 49 | #include "mptcp.h" |
| 50 | #include "tcp.h" |
| 51 | |
| 52 | static int dummy_print(const u_char *opt _U_, u_int opt_len _U_, u_char flags _U_) |
| 53 | { |
| 54 | return 1; |
| 55 | } |
| 56 | |
| 57 | static int mp_capable_print(const u_char *opt, u_int opt_len, u_char flags) |
| 58 | { |
| 59 | struct mp_capable *mpc = (struct mp_capable *) opt; |
| 60 | |
| 61 | if (!(opt_len == 12 && flags & TH_SYN) && |
| 62 | !(opt_len == 20 && (flags & (TH_SYN | TH_ACK)) == TH_ACK)) |
| 63 | return 0; |
| 64 | |
| 65 | if (MP_CAPABLE_OPT_VERSION(mpc->sub_ver) != 0) { |
| 66 | printf(" Unknown Version (%d)", MP_CAPABLE_OPT_VERSION(mpc->sub_ver)); |
| 67 | return 1; |
| 68 | } |
| 69 | |
| 70 | if (mpc->flags & MP_CAPABLE_C) |
| 71 | printf(" csum"); |
| 72 | printf(" {0x%" PRIx64, EXTRACT_64BITS(mpc->sender_key)); |
| 73 | if (opt_len == 20) /* ACK */ |
| 74 | printf(",0x%" PRIx64, EXTRACT_64BITS(mpc->receiver_key)); |
| 75 | printf("}"); |
| 76 | return 1; |
| 77 | } |
| 78 | |
| 79 | static int mp_join_print(const u_char *opt, u_int opt_len, u_char flags) |
| 80 | { |
| 81 | struct mp_join *mpj = (struct mp_join *) opt; |
| 82 | |
| 83 | if (!(opt_len == 12 && flags & TH_SYN) && |
| 84 | !(opt_len == 16 && (flags & (TH_SYN | TH_ACK)) == (TH_SYN | TH_ACK)) && |
| 85 | !(opt_len == 24 && flags & TH_ACK)) |
| 86 | return 0; |
| 87 | |
| 88 | if (opt_len != 24) { |
| 89 | if (mpj->sub_b & MP_JOIN_B) |
| 90 | printf(" backup"); |
| 91 | printf(" id %u", mpj->addr_id); |
| 92 | } |
| 93 | |
| 94 | switch (opt_len) { |
| 95 | case 12: /* SYN */ |
| 96 | printf(" token 0x%x" " nonce 0x%x", |
| 97 | EXTRACT_32BITS(mpj->u.syn.token), |
| 98 | EXTRACT_32BITS(mpj->u.syn.nonce)); |
| 99 | break; |
| 100 | case 16: /* SYN/ACK */ |
| 101 | printf(" hmac 0x%" PRIx64 " nonce 0x%x", |
| 102 | EXTRACT_64BITS(mpj->u.synack.mac), |
| 103 | EXTRACT_32BITS(mpj->u.synack.nonce)); |
| 104 | break; |
| 105 | case 24: {/* ACK */ |
| 106 | size_t i; |
| 107 | printf(" hmac 0x"); |
| 108 | for (i = 0; i < sizeof(mpj->u.ack.mac); ++i) |
| 109 | printf("%02x", mpj->u.ack.mac[i]); |
| 110 | } |
| 111 | default: |
| 112 | break; |
| 113 | } |
| 114 | return 1; |
| 115 | } |
| 116 | |
| 117 | static u_int mp_dss_len(struct mp_dss *m, int csum) |
| 118 | { |
| 119 | u_int len; |
| 120 | |
| 121 | len = 4; |
| 122 | if (m->flags & MP_DSS_A) { |
| 123 | /* Ack present - 4 or 8 octets */ |
| 124 | len += (m->flags & MP_DSS_a) ? 8 : 4; |
| 125 | } |
| 126 | if (m->flags & MP_DSS_M) { |
| 127 | /* |
| 128 | * Data Sequence Number (DSN), Subflow Sequence Number (SSN), |
| 129 | * Data-Level Length present, and Checksum possibly present. |
| 130 | * All but the Checksum are 10 bytes if the m flag is |
| 131 | * clear (4-byte DSN) and 14 bytes if the m flag is set |
| 132 | * (8-byte DSN). |
| 133 | */ |
| 134 | len += (m->flags & MP_DSS_m) ? 14 : 10; |
| 135 | |
| 136 | /* |
| 137 | * The Checksum is present only if negotiated. |
| 138 | */ |
| 139 | if (csum) |
| 140 | len += 2; |
| 141 | } |
| 142 | return len; |
| 143 | } |
| 144 | |
| 145 | static int mp_dss_print(const u_char *opt, u_int opt_len, u_char flags) |
| 146 | { |
| 147 | struct mp_dss *mdss = (struct mp_dss *) opt; |
| 148 | |
| 149 | if ((opt_len != mp_dss_len(mdss, 1) && |
| 150 | opt_len != mp_dss_len(mdss, 0)) || flags & TH_SYN) |
| 151 | return 0; |
| 152 | |
| 153 | if (mdss->flags & MP_DSS_F) |
| 154 | printf(" fin"); |
| 155 | |
| 156 | opt += 4; |
| 157 | if (mdss->flags & MP_DSS_A) { |
| 158 | printf(" ack "); |
| 159 | if (mdss->flags & MP_DSS_a) { |
| 160 | printf("%" PRIu64, EXTRACT_64BITS(opt)); |
| 161 | opt += 8; |
| 162 | } else { |
| 163 | printf("%u", EXTRACT_32BITS(opt)); |
| 164 | opt += 4; |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | if (mdss->flags & MP_DSS_M) { |
| 169 | printf(" seq "); |
| 170 | if (mdss->flags & MP_DSS_m) { |
| 171 | printf("%" PRIu64, EXTRACT_64BITS(opt)); |
| 172 | opt += 8; |
| 173 | } else { |
| 174 | printf("%u", EXTRACT_32BITS(opt)); |
| 175 | opt += 4; |
| 176 | } |
| 177 | printf(" subseq %u", EXTRACT_32BITS(opt)); |
| 178 | opt += 4; |
| 179 | printf(" len %u", EXTRACT_16BITS(opt)); |
| 180 | opt += 2; |
| 181 | |
| 182 | if (opt_len == mp_dss_len(mdss, 1)) |
| 183 | printf(" csum 0x%x", EXTRACT_16BITS(opt)); |
| 184 | } |
| 185 | return 1; |
| 186 | } |
| 187 | |
| 188 | static int add_addr_print(const u_char *opt, u_int opt_len, u_char flags _U_) |
| 189 | { |
| 190 | struct mp_add_addr *add_addr = (struct mp_add_addr *) opt; |
| 191 | u_int ipver = MP_ADD_ADDR_IPVER(add_addr->sub_ipver); |
| 192 | |
| 193 | if (!((opt_len == 8 || opt_len == 10) && ipver == 4) && |
| 194 | !((opt_len == 20 || opt_len == 22) && ipver == 6)) |
| 195 | return 0; |
| 196 | |
| 197 | printf(" id %u", add_addr->addr_id); |
| 198 | switch (ipver) { |
| 199 | case 4: |
| 200 | printf(" %s", ipaddr_string(add_addr->u.v4.addr)); |
| 201 | if (opt_len == 10) |
| 202 | printf(":%u", EXTRACT_16BITS(add_addr->u.v4.port)); |
| 203 | break; |
| 204 | case 6: |
| 205 | #ifdef INET6 |
| 206 | printf(" %s", ip6addr_string(add_addr->u.v6.addr)); |
| 207 | #endif |
| 208 | if (opt_len == 22) |
| 209 | printf(":%u", EXTRACT_16BITS(add_addr->u.v6.port)); |
| 210 | break; |
| 211 | default: |
| 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | return 1; |
| 216 | } |
| 217 | |
| 218 | static int remove_addr_print(const u_char *opt, u_int opt_len, u_char flags _U_) |
| 219 | { |
| 220 | struct mp_remove_addr *remove_addr = (struct mp_remove_addr *) opt; |
| 221 | u_int8_t *addr_id = &remove_addr->addrs_id; |
| 222 | |
| 223 | if (opt_len < 4) |
| 224 | return 0; |
| 225 | |
| 226 | opt_len -= 3; |
| 227 | printf(" id"); |
| 228 | while (opt_len--) |
| 229 | printf(" %u", *addr_id++); |
| 230 | return 1; |
| 231 | } |
| 232 | |
| 233 | static int mp_prio_print(const u_char *opt, u_int opt_len, u_char flags _U_) |
| 234 | { |
| 235 | struct mp_prio *mpp = (struct mp_prio *) opt; |
| 236 | |
| 237 | if (opt_len != 3 && opt_len != 4) |
| 238 | return 0; |
| 239 | |
| 240 | if (mpp->sub_b & MP_PRIO_B) |
| 241 | printf(" backup"); |
| 242 | else |
| 243 | printf(" non-backup"); |
| 244 | if (opt_len == 4) |
| 245 | printf(" id %u", mpp->addr_id); |
| 246 | |
| 247 | return 1; |
| 248 | } |
| 249 | |
| 250 | static int mp_fail_print(const u_char *opt, u_int opt_len, u_char flags _U_) |
| 251 | { |
| 252 | if (opt_len != 12) |
| 253 | return 0; |
| 254 | |
| 255 | printf(" seq %" PRIu64, EXTRACT_64BITS(opt + 4)); |
| 256 | return 1; |
| 257 | } |
| 258 | |
| 259 | static int mp_fast_close_print(const u_char *opt, u_int opt_len, u_char flags _U_) |
| 260 | { |
| 261 | if (opt_len != 12) |
| 262 | return 0; |
| 263 | |
| 264 | printf(" key 0x%" PRIx64, EXTRACT_64BITS(opt + 4)); |
| 265 | return 1; |
| 266 | } |
| 267 | |
| 268 | static struct { |
| 269 | const char *name; |
| 270 | int (*print)(const u_char *, u_int, u_char); |
| 271 | } mptcp_options[] = { |
| 272 | { "capable", mp_capable_print}, |
| 273 | { "join", mp_join_print }, |
| 274 | { "dss", mp_dss_print }, |
| 275 | { "add-addr", add_addr_print }, |
| 276 | { "rem-addr", remove_addr_print }, |
| 277 | { "prio", mp_prio_print }, |
| 278 | { "fail", mp_fail_print }, |
| 279 | { "fast-close", mp_fast_close_print }, |
| 280 | { "unknown", dummy_print }, |
| 281 | }; |
| 282 | |
| 283 | int mptcp_print(const u_char *cp, u_int len, u_char flags) |
| 284 | { |
| 285 | struct mptcp_option *opt; |
| 286 | u_int subtype; |
| 287 | |
| 288 | if (len < 3) |
| 289 | return 0; |
| 290 | |
| 291 | opt = (struct mptcp_option *) cp; |
| 292 | subtype = min(MPTCP_OPT_SUBTYPE(opt->sub_etc), MPTCP_SUB_FCLOSE + 1); |
| 293 | |
| 294 | printf(" %s", mptcp_options[subtype].name); |
| 295 | return mptcp_options[subtype].print(cp, len, flags); |
| 296 | } |