ee67461e56
Local changes: - Update some local modifications to fix build - Synch config.h with upstream as much as possible Changelog: https://git.tcpdump.org/tcpdump/blob/55bc126b0216cfe409b8d6bd378f65679d136ddf:/CHANGES Reviewed by: emaste Obtained from: https://www.tcpdump.org/release/tcpdump-4.99.4.tar.gz Sponsored by: The FreeBSD Foundation
486 lines
15 KiB
C
486 lines
15 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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/* \summary: Multipath TCP (MPTCP) printer */
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/* specification: RFC 6824 */
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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 "netdissect-stdinc.h"
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#include "netdissect.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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nd_uint8_t kind;
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nd_uint8_t len;
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nd_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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nd_uint8_t kind;
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nd_uint8_t len;
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nd_uint8_t sub_ver;
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nd_uint8_t flags;
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nd_uint64_t sender_key;
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nd_uint64_t receiver_key;
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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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nd_uint8_t kind;
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nd_uint8_t len;
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nd_uint8_t sub_b;
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nd_uint8_t addr_id;
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union {
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struct {
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nd_uint32_t token;
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nd_uint32_t nonce;
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} syn;
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struct {
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nd_uint64_t mac;
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nd_uint32_t nonce;
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} synack;
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struct {
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nd_byte 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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nd_uint8_t kind;
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nd_uint8_t len;
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nd_uint8_t sub;
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nd_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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static const struct tok mptcp_addr_subecho_bits[] = {
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{ 0x6, "v0-ip6" },
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{ 0x4, "v0-ip4" },
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{ 0x1, "v1-echo" },
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{ 0x0, "v1" },
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{ 0, NULL }
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};
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struct mp_add_addr {
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nd_uint8_t kind;
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nd_uint8_t len;
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nd_uint8_t sub_echo;
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nd_uint8_t addr_id;
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union {
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struct {
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nd_ipv4 addr;
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nd_uint16_t port;
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nd_uint64_t mac;
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} v4;
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struct {
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nd_ipv4 addr;
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nd_uint64_t mac;
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} v4np;
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struct {
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nd_ipv6 addr;
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nd_uint16_t port;
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nd_uint64_t mac;
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} v6;
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struct {
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nd_ipv6 addr;
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nd_uint64_t mac;
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} v6np;
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} u;
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};
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struct mp_remove_addr {
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nd_uint8_t kind;
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nd_uint8_t len;
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nd_uint8_t sub;
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/* list of addr_id */
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nd_uint8_t addrs_id[1];
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};
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struct mp_fail {
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nd_uint8_t kind;
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nd_uint8_t len;
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nd_uint8_t sub;
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nd_uint8_t resv;
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nd_uint64_t data_seq;
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};
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struct mp_close {
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nd_uint8_t kind;
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nd_uint8_t len;
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nd_uint8_t sub;
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nd_uint8_t rsv;
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nd_byte key[8];
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};
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struct mp_prio {
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nd_uint8_t kind;
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nd_uint8_t len;
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nd_uint8_t sub_b;
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nd_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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const struct mp_capable *mpc = (const struct mp_capable *) opt;
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uint8_t version;
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if (!((opt_len == 12 || opt_len == 4) && flags & TH_SYN) &&
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!((opt_len == 20 || opt_len == 22) && (flags & (TH_SYN | TH_ACK)) ==
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TH_ACK))
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return 0;
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version = MP_CAPABLE_OPT_VERSION(GET_U_1(mpc->sub_ver));
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switch (version) {
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case 0: /* fall through */
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case 1:
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ND_PRINT(" v%u", version);
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break;
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default:
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ND_PRINT(" Unknown Version (%u)", version);
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return 1;
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}
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if (GET_U_1(mpc->flags) & MP_CAPABLE_C)
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ND_PRINT(" csum");
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if (opt_len == 12 || opt_len >= 20) {
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ND_PRINT(" {0x%" PRIx64, GET_BE_U_8(mpc->sender_key));
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if (opt_len >= 20)
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ND_PRINT(",0x%" PRIx64, GET_BE_U_8(mpc->receiver_key));
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ND_PRINT("}");
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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_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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const struct mp_join *mpj = (const 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 (GET_U_1(mpj->sub_b) & MP_JOIN_B)
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ND_PRINT(" backup");
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ND_PRINT(" id %u", GET_U_1(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(" token 0x%x" " nonce 0x%x",
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GET_BE_U_4(mpj->u.syn.token),
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GET_BE_U_4(mpj->u.syn.nonce));
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break;
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case 16: /* SYN/ACK */
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ND_PRINT(" hmac 0x%" PRIx64 " nonce 0x%x",
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GET_BE_U_8(mpj->u.synack.mac),
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GET_BE_U_4(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(" hmac 0x");
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for (i = 0; i < sizeof(mpj->u.ack.mac); ++i)
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ND_PRINT("%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 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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const struct mp_dss *mdss = (const struct mp_dss *) opt;
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uint8_t mdss_flags;
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/* We need the flags, at a minimum. */
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if (opt_len < 4)
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return 0;
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if (flags & TH_SYN)
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return 0;
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mdss_flags = GET_U_1(mdss->flags);
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if (mdss_flags & MP_DSS_F)
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ND_PRINT(" fin");
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opt += 4;
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opt_len -= 4;
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if (mdss_flags & MP_DSS_A) {
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/* Ack present */
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ND_PRINT(" ack ");
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/*
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* If the a flag is set, we have an 8-byte ack; if it's
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* clear, we have a 4-byte ack.
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*/
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if (mdss_flags & MP_DSS_a) {
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if (opt_len < 8)
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return 0;
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ND_PRINT("%" PRIu64, GET_BE_U_8(opt));
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opt += 8;
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opt_len -= 8;
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} else {
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if (opt_len < 4)
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return 0;
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ND_PRINT("%u", GET_BE_U_4(opt));
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opt += 4;
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opt_len -= 4;
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}
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}
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if (mdss_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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*/
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ND_PRINT(" seq ");
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/*
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* If the m flag is set, we have an 8-byte NDS; if it's clear,
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* we have a 4-byte DSN.
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*/
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if (mdss_flags & MP_DSS_m) {
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if (opt_len < 8)
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return 0;
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ND_PRINT("%" PRIu64, GET_BE_U_8(opt));
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opt += 8;
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opt_len -= 8;
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} else {
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if (opt_len < 4)
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return 0;
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ND_PRINT("%u", GET_BE_U_4(opt));
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opt += 4;
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opt_len -= 4;
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}
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if (opt_len < 4)
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return 0;
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ND_PRINT(" subseq %u", GET_BE_U_4(opt));
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opt += 4;
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opt_len -= 4;
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if (opt_len < 2)
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return 0;
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ND_PRINT(" len %u", GET_BE_U_2(opt));
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opt += 2;
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opt_len -= 2;
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/*
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* The Checksum is present only if negotiated.
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* If there are at least 2 bytes left, process the next 2
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* bytes as the Checksum.
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*/
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if (opt_len >= 2) {
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ND_PRINT(" csum 0x%x", GET_BE_U_2(opt));
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opt_len -= 2;
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}
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}
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if (opt_len != 0)
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return 0;
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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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const struct mp_add_addr *add_addr = (const struct mp_add_addr *) opt;
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if (!(opt_len == 8 || opt_len == 10 || opt_len == 16 || opt_len == 18 ||
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opt_len == 20 || opt_len == 22 || opt_len == 28 || opt_len == 30))
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return 0;
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ND_PRINT(" %s",
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tok2str(mptcp_addr_subecho_bits, "[bad version/echo]",
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GET_U_1(add_addr->sub_echo) & 0xF));
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ND_PRINT(" id %u", GET_U_1(add_addr->addr_id));
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if (opt_len == 8 || opt_len == 10 || opt_len == 16 || opt_len == 18) {
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ND_PRINT(" %s", GET_IPADDR_STRING(add_addr->u.v4.addr));
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if (opt_len == 10 || opt_len == 18)
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ND_PRINT(":%u", GET_BE_U_2(add_addr->u.v4.port));
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if (opt_len == 16)
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ND_PRINT(" hmac 0x%" PRIx64, GET_BE_U_8(add_addr->u.v4np.mac));
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if (opt_len == 18)
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ND_PRINT(" hmac 0x%" PRIx64, GET_BE_U_8(add_addr->u.v4.mac));
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}
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if (opt_len == 20 || opt_len == 22 || opt_len == 28 || opt_len == 30) {
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ND_PRINT(" %s", GET_IP6ADDR_STRING(add_addr->u.v6.addr));
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if (opt_len == 22 || opt_len == 30)
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ND_PRINT(":%u", GET_BE_U_2(add_addr->u.v6.port));
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if (opt_len == 28)
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ND_PRINT(" hmac 0x%" PRIx64, GET_BE_U_8(add_addr->u.v6np.mac));
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if (opt_len == 30)
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ND_PRINT(" hmac 0x%" PRIx64, GET_BE_U_8(add_addr->u.v6.mac));
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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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const struct mp_remove_addr *remove_addr = (const struct mp_remove_addr *) opt;
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u_int i;
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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(" id");
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for (i = 0; i < opt_len; i++)
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ND_PRINT(" %u", GET_U_1(remove_addr->addrs_id[i]));
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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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const struct mp_prio *mpp = (const 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 (GET_U_1(mpp->sub_b) & MP_PRIO_B)
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ND_PRINT(" backup");
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else
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ND_PRINT(" non-backup");
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if (opt_len == 4)
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ND_PRINT(" id %u", GET_U_1(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(" seq %" PRIu64, GET_BE_U_8(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(" key 0x%" PRIx64, GET_BE_U_8(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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const struct mptcp_option *opt;
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u_int subtype;
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ndo->ndo_protocol = "mptcp";
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if (len < 3)
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return 0;
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opt = (const struct mptcp_option *) cp;
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subtype = MPTCP_OPT_SUBTYPE(GET_U_1(opt->sub_etc));
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subtype = ND_MIN(subtype, MPTCP_SUB_FCLOSE + 1);
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ND_PRINT(" %u", len);
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ND_PRINT(" %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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