430 lines
13 KiB
C
430 lines
13 KiB
C
/**
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* Copyright (c) 2012
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*
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* Gregory Detal <gregory.detal@uclouvain.be>
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* Christoph Paasch <christoph.paasch@uclouvain.be>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the University nor of the Laboratory may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#define NETDISSECT_REWORKED
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include "interface.h"
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#include "extract.h"
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#include "addrtoname.h"
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#include "tcp.h"
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#define MPTCP_SUB_CAPABLE 0x0
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#define MPTCP_SUB_JOIN 0x1
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#define MPTCP_SUB_DSS 0x2
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#define MPTCP_SUB_ADD_ADDR 0x3
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#define MPTCP_SUB_REMOVE_ADDR 0x4
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#define MPTCP_SUB_PRIO 0x5
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#define MPTCP_SUB_FAIL 0x6
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#define MPTCP_SUB_FCLOSE 0x7
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struct mptcp_option {
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uint8_t kind;
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uint8_t len;
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uint8_t sub_etc; /* subtype upper 4 bits, other stuff lower 4 bits */
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};
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#define MPTCP_OPT_SUBTYPE(sub_etc) (((sub_etc) >> 4) & 0xF)
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struct mp_capable {
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uint8_t kind;
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uint8_t len;
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uint8_t sub_ver;
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uint8_t flags;
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uint8_t sender_key[8];
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uint8_t receiver_key[8];
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};
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#define MP_CAPABLE_OPT_VERSION(sub_ver) (((sub_ver) >> 0) & 0xF)
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#define MP_CAPABLE_C 0x80
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#define MP_CAPABLE_S 0x01
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struct mp_join {
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uint8_t kind;
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uint8_t len;
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uint8_t sub_b;
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uint8_t addr_id;
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union {
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struct {
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uint8_t token[4];
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uint8_t nonce[4];
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} syn;
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struct {
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uint8_t mac[8];
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uint8_t nonce[4];
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} synack;
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struct {
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uint8_t mac[20];
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} ack;
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} u;
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};
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#define MP_JOIN_B 0x01
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struct mp_dss {
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uint8_t kind;
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uint8_t len;
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uint8_t sub;
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uint8_t flags;
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};
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#define MP_DSS_F 0x10
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#define MP_DSS_m 0x08
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#define MP_DSS_M 0x04
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#define MP_DSS_a 0x02
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#define MP_DSS_A 0x01
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struct mp_add_addr {
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uint8_t kind;
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uint8_t len;
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uint8_t sub_ipver;
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uint8_t addr_id;
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union {
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struct {
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uint8_t addr[4];
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uint8_t port[2];
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} v4;
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struct {
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uint8_t addr[16];
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uint8_t port[2];
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} v6;
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} u;
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};
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#define MP_ADD_ADDR_IPVER(sub_ipver) (((sub_ipver) >> 0) & 0xF)
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struct mp_remove_addr {
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uint8_t kind;
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uint8_t len;
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uint8_t sub;
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/* list of addr_id */
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uint8_t addrs_id;
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};
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struct mp_fail {
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uint8_t kind;
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uint8_t len;
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uint8_t sub;
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uint8_t resv;
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uint8_t data_seq[8];
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};
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struct mp_close {
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uint8_t kind;
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uint8_t len;
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uint8_t sub;
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uint8_t rsv;
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uint8_t key[8];
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};
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struct mp_prio {
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uint8_t kind;
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uint8_t len;
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uint8_t sub_b;
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uint8_t addr_id;
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};
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#define MP_PRIO_B 0x01
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static int
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dummy_print(netdissect_options *ndo _U_,
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const u_char *opt _U_, u_int opt_len _U_, u_char flags _U_)
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{
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return 1;
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}
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static int
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mp_capable_print(netdissect_options *ndo,
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const u_char *opt, u_int opt_len, u_char flags)
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{
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struct mp_capable *mpc = (struct mp_capable *) opt;
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if (!(opt_len == 12 && flags & TH_SYN) &&
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!(opt_len == 20 && (flags & (TH_SYN | TH_ACK)) == TH_ACK))
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return 0;
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if (MP_CAPABLE_OPT_VERSION(mpc->sub_ver) != 0) {
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ND_PRINT((ndo, " Unknown Version (%d)", MP_CAPABLE_OPT_VERSION(mpc->sub_ver)));
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return 1;
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}
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if (mpc->flags & MP_CAPABLE_C)
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ND_PRINT((ndo, " csum"));
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ND_PRINT((ndo, " {0x%" PRIx64, EXTRACT_64BITS(mpc->sender_key)));
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if (opt_len == 20) /* ACK */
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ND_PRINT((ndo, ",0x%" PRIx64, EXTRACT_64BITS(mpc->receiver_key)));
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ND_PRINT((ndo, "}"));
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return 1;
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}
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static int
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mp_join_print(netdissect_options *ndo,
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const u_char *opt, u_int opt_len, u_char flags)
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{
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struct mp_join *mpj = (struct mp_join *) opt;
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if (!(opt_len == 12 && flags & TH_SYN) &&
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!(opt_len == 16 && (flags & (TH_SYN | TH_ACK)) == (TH_SYN | TH_ACK)) &&
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!(opt_len == 24 && flags & TH_ACK))
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return 0;
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if (opt_len != 24) {
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if (mpj->sub_b & MP_JOIN_B)
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ND_PRINT((ndo, " backup"));
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ND_PRINT((ndo, " id %u", mpj->addr_id));
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}
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switch (opt_len) {
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case 12: /* SYN */
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ND_PRINT((ndo, " token 0x%x" " nonce 0x%x",
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EXTRACT_32BITS(mpj->u.syn.token),
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EXTRACT_32BITS(mpj->u.syn.nonce)));
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break;
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case 16: /* SYN/ACK */
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ND_PRINT((ndo, " hmac 0x%" PRIx64 " nonce 0x%x",
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EXTRACT_64BITS(mpj->u.synack.mac),
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EXTRACT_32BITS(mpj->u.synack.nonce)));
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break;
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case 24: {/* ACK */
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size_t i;
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ND_PRINT((ndo, " hmac 0x"));
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for (i = 0; i < sizeof(mpj->u.ack.mac); ++i)
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ND_PRINT((ndo, "%02x", mpj->u.ack.mac[i]));
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}
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default:
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break;
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}
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return 1;
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}
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static u_int mp_dss_len(struct mp_dss *m, int csum)
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{
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u_int len;
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len = 4;
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if (m->flags & MP_DSS_A) {
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/* Ack present - 4 or 8 octets */
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len += (m->flags & MP_DSS_a) ? 8 : 4;
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}
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if (m->flags & MP_DSS_M) {
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/*
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* Data Sequence Number (DSN), Subflow Sequence Number (SSN),
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* Data-Level Length present, and Checksum possibly present.
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* All but the Checksum are 10 bytes if the m flag is
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* clear (4-byte DSN) and 14 bytes if the m flag is set
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* (8-byte DSN).
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*/
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len += (m->flags & MP_DSS_m) ? 14 : 10;
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/*
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* The Checksum is present only if negotiated.
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*/
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if (csum)
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len += 2;
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}
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return len;
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}
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static int
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mp_dss_print(netdissect_options *ndo,
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const u_char *opt, u_int opt_len, u_char flags)
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{
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struct mp_dss *mdss = (struct mp_dss *) opt;
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if ((opt_len != mp_dss_len(mdss, 1) &&
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opt_len != mp_dss_len(mdss, 0)) || flags & TH_SYN)
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return 0;
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if (mdss->flags & MP_DSS_F)
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ND_PRINT((ndo, " fin"));
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opt += 4;
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if (mdss->flags & MP_DSS_A) {
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ND_PRINT((ndo, " ack "));
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if (mdss->flags & MP_DSS_a) {
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ND_PRINT((ndo, "%" PRIu64, EXTRACT_64BITS(opt)));
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opt += 8;
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} else {
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ND_PRINT((ndo, "%u", EXTRACT_32BITS(opt)));
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opt += 4;
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}
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}
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if (mdss->flags & MP_DSS_M) {
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ND_PRINT((ndo, " seq "));
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if (mdss->flags & MP_DSS_m) {
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ND_PRINT((ndo, "%" PRIu64, EXTRACT_64BITS(opt)));
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opt += 8;
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} else {
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ND_PRINT((ndo, "%u", EXTRACT_32BITS(opt)));
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opt += 4;
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}
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ND_PRINT((ndo, " subseq %u", EXTRACT_32BITS(opt)));
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opt += 4;
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ND_PRINT((ndo, " len %u", EXTRACT_16BITS(opt)));
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opt += 2;
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if (opt_len == mp_dss_len(mdss, 1))
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ND_PRINT((ndo, " csum 0x%x", EXTRACT_16BITS(opt)));
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}
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return 1;
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}
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static int
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add_addr_print(netdissect_options *ndo,
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const u_char *opt, u_int opt_len, u_char flags _U_)
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{
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struct mp_add_addr *add_addr = (struct mp_add_addr *) opt;
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u_int ipver = MP_ADD_ADDR_IPVER(add_addr->sub_ipver);
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if (!((opt_len == 8 || opt_len == 10) && ipver == 4) &&
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!((opt_len == 20 || opt_len == 22) && ipver == 6))
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return 0;
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ND_PRINT((ndo, " id %u", add_addr->addr_id));
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switch (ipver) {
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case 4:
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ND_PRINT((ndo, " %s", ipaddr_string(ndo, add_addr->u.v4.addr)));
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if (opt_len == 10)
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ND_PRINT((ndo, ":%u", EXTRACT_16BITS(add_addr->u.v4.port)));
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break;
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case 6:
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#ifdef INET6
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ND_PRINT((ndo, " %s", ip6addr_string(ndo, add_addr->u.v6.addr)));
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#endif
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if (opt_len == 22)
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ND_PRINT((ndo, ":%u", EXTRACT_16BITS(add_addr->u.v6.port)));
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break;
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default:
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return 0;
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}
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return 1;
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}
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static int
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remove_addr_print(netdissect_options *ndo,
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const u_char *opt, u_int opt_len, u_char flags _U_)
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{
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struct mp_remove_addr *remove_addr = (struct mp_remove_addr *) opt;
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uint8_t *addr_id = &remove_addr->addrs_id;
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if (opt_len < 4)
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return 0;
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opt_len -= 3;
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ND_PRINT((ndo, " id"));
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while (opt_len--)
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ND_PRINT((ndo, " %u", *addr_id++));
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return 1;
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}
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static int
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mp_prio_print(netdissect_options *ndo,
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const u_char *opt, u_int opt_len, u_char flags _U_)
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{
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struct mp_prio *mpp = (struct mp_prio *) opt;
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if (opt_len != 3 && opt_len != 4)
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return 0;
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if (mpp->sub_b & MP_PRIO_B)
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ND_PRINT((ndo, " backup"));
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else
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ND_PRINT((ndo, " non-backup"));
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if (opt_len == 4)
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ND_PRINT((ndo, " id %u", mpp->addr_id));
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return 1;
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}
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static int
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mp_fail_print(netdissect_options *ndo,
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const u_char *opt, u_int opt_len, u_char flags _U_)
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{
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if (opt_len != 12)
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return 0;
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ND_PRINT((ndo, " seq %" PRIu64, EXTRACT_64BITS(opt + 4)));
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return 1;
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}
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static int
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mp_fast_close_print(netdissect_options *ndo,
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const u_char *opt, u_int opt_len, u_char flags _U_)
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{
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if (opt_len != 12)
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return 0;
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ND_PRINT((ndo, " key 0x%" PRIx64, EXTRACT_64BITS(opt + 4)));
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return 1;
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}
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static const struct {
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const char *name;
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int (*print)(netdissect_options *, const u_char *, u_int, u_char);
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} mptcp_options[] = {
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{ "capable", mp_capable_print},
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{ "join", mp_join_print },
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{ "dss", mp_dss_print },
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{ "add-addr", add_addr_print },
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{ "rem-addr", remove_addr_print },
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{ "prio", mp_prio_print },
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{ "fail", mp_fail_print },
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{ "fast-close", mp_fast_close_print },
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{ "unknown", dummy_print },
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};
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int
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mptcp_print(netdissect_options *ndo,
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const u_char *cp, u_int len, u_char flags)
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{
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struct mptcp_option *opt;
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u_int subtype;
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if (len < 3)
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return 0;
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opt = (struct mptcp_option *) cp;
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subtype = min(MPTCP_OPT_SUBTYPE(opt->sub_etc), MPTCP_SUB_FCLOSE + 1);
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ND_PRINT((ndo, " %s", mptcp_options[subtype].name));
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return mptcp_options[subtype].print(ndo, cp, len, flags);
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}
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