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-rw-r--r--print-mptcp.c485
1 files changed, 485 insertions, 0 deletions
diff --git a/print-mptcp.c b/print-mptcp.c
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+++ b/print-mptcp.c
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+/**
+ * Copyright (c) 2012
+ *
+ * Gregory Detal <gregory.detal@uclouvain.be>
+ * Christoph Paasch <christoph.paasch@uclouvain.be>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the University nor of the Laboratory may be used
+ * to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/* \summary: Multipath TCP (MPTCP) printer */
+
+/* specification: RFC 6824 */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#include "netdissect.h"
+#include "extract.h"
+#include "addrtoname.h"
+
+#include "tcp.h"
+
+#define MPTCP_SUB_CAPABLE 0x0
+#define MPTCP_SUB_JOIN 0x1
+#define MPTCP_SUB_DSS 0x2
+#define MPTCP_SUB_ADD_ADDR 0x3
+#define MPTCP_SUB_REMOVE_ADDR 0x4
+#define MPTCP_SUB_PRIO 0x5
+#define MPTCP_SUB_FAIL 0x6
+#define MPTCP_SUB_FCLOSE 0x7
+
+struct mptcp_option {
+ nd_uint8_t kind;
+ nd_uint8_t len;
+ nd_uint8_t sub_etc; /* subtype upper 4 bits, other stuff lower 4 bits */
+};
+
+#define MPTCP_OPT_SUBTYPE(sub_etc) (((sub_etc) >> 4) & 0xF)
+
+struct mp_capable {
+ nd_uint8_t kind;
+ nd_uint8_t len;
+ nd_uint8_t sub_ver;
+ nd_uint8_t flags;
+ nd_uint64_t sender_key;
+ nd_uint64_t receiver_key;
+};
+
+#define MP_CAPABLE_OPT_VERSION(sub_ver) (((sub_ver) >> 0) & 0xF)
+#define MP_CAPABLE_C 0x80
+#define MP_CAPABLE_S 0x01
+
+struct mp_join {
+ nd_uint8_t kind;
+ nd_uint8_t len;
+ nd_uint8_t sub_b;
+ nd_uint8_t addr_id;
+ union {
+ struct {
+ nd_uint32_t token;
+ nd_uint32_t nonce;
+ } syn;
+ struct {
+ nd_uint64_t mac;
+ nd_uint32_t nonce;
+ } synack;
+ struct {
+ nd_byte mac[20];
+ } ack;
+ } u;
+};
+
+#define MP_JOIN_B 0x01
+
+struct mp_dss {
+ nd_uint8_t kind;
+ nd_uint8_t len;
+ nd_uint8_t sub;
+ nd_uint8_t flags;
+};
+
+#define MP_DSS_F 0x10
+#define MP_DSS_m 0x08
+#define MP_DSS_M 0x04
+#define MP_DSS_a 0x02
+#define MP_DSS_A 0x01
+
+static const struct tok mptcp_addr_subecho_bits[] = {
+ { 0x6, "v0-ip6" },
+ { 0x4, "v0-ip4" },
+ { 0x1, "v1-echo" },
+ { 0x0, "v1" },
+ { 0, NULL }
+};
+
+struct mp_add_addr {
+ nd_uint8_t kind;
+ nd_uint8_t len;
+ nd_uint8_t sub_echo;
+ nd_uint8_t addr_id;
+ union {
+ struct {
+ nd_ipv4 addr;
+ nd_uint16_t port;
+ nd_uint64_t mac;
+ } v4;
+ struct {
+ nd_ipv4 addr;
+ nd_uint64_t mac;
+ } v4np;
+ struct {
+ nd_ipv6 addr;
+ nd_uint16_t port;
+ nd_uint64_t mac;
+ } v6;
+ struct {
+ nd_ipv6 addr;
+ nd_uint64_t mac;
+ } v6np;
+ } u;
+};
+
+struct mp_remove_addr {
+ nd_uint8_t kind;
+ nd_uint8_t len;
+ nd_uint8_t sub;
+ /* list of addr_id */
+ nd_uint8_t addrs_id[1];
+};
+
+struct mp_fail {
+ nd_uint8_t kind;
+ nd_uint8_t len;
+ nd_uint8_t sub;
+ nd_uint8_t resv;
+ nd_uint64_t data_seq;
+};
+
+struct mp_close {
+ nd_uint8_t kind;
+ nd_uint8_t len;
+ nd_uint8_t sub;
+ nd_uint8_t rsv;
+ nd_byte key[8];
+};
+
+struct mp_prio {
+ nd_uint8_t kind;
+ nd_uint8_t len;
+ nd_uint8_t sub_b;
+ nd_uint8_t addr_id;
+};
+
+#define MP_PRIO_B 0x01
+
+static int
+dummy_print(netdissect_options *ndo _U_,
+ const u_char *opt _U_, u_int opt_len _U_, u_char flags _U_)
+{
+ return 1;
+}
+
+static int
+mp_capable_print(netdissect_options *ndo,
+ const u_char *opt, u_int opt_len, u_char flags)
+{
+ const struct mp_capable *mpc = (const struct mp_capable *) opt;
+ uint8_t version;
+
+ if (!((opt_len == 12 || opt_len == 4) && flags & TH_SYN) &&
+ !((opt_len == 20 || opt_len == 22) && (flags & (TH_SYN | TH_ACK)) ==
+ TH_ACK))
+ return 0;
+
+ version = MP_CAPABLE_OPT_VERSION(GET_U_1(mpc->sub_ver));
+ switch (version) {
+ case 0: /* fall through */
+ case 1:
+ ND_PRINT(" v%u", version);
+ break;
+ default:
+ ND_PRINT(" Unknown Version (%u)", version);
+ return 1;
+ }
+
+ if (GET_U_1(mpc->flags) & MP_CAPABLE_C)
+ ND_PRINT(" csum");
+ if (opt_len == 12 || opt_len >= 20) {
+ ND_PRINT(" {0x%" PRIx64, GET_BE_U_8(mpc->sender_key));
+ if (opt_len >= 20)
+ ND_PRINT(",0x%" PRIx64, GET_BE_U_8(mpc->receiver_key));
+ ND_PRINT("}");
+ }
+ return 1;
+}
+
+static int
+mp_join_print(netdissect_options *ndo,
+ const u_char *opt, u_int opt_len, u_char flags)
+{
+ const struct mp_join *mpj = (const struct mp_join *) opt;
+
+ if (!(opt_len == 12 && (flags & TH_SYN)) &&
+ !(opt_len == 16 && (flags & (TH_SYN | TH_ACK)) == (TH_SYN | TH_ACK)) &&
+ !(opt_len == 24 && (flags & TH_ACK)))
+ return 0;
+
+ if (opt_len != 24) {
+ if (GET_U_1(mpj->sub_b) & MP_JOIN_B)
+ ND_PRINT(" backup");
+ ND_PRINT(" id %u", GET_U_1(mpj->addr_id));
+ }
+
+ switch (opt_len) {
+ case 12: /* SYN */
+ ND_PRINT(" token 0x%x" " nonce 0x%x",
+ GET_BE_U_4(mpj->u.syn.token),
+ GET_BE_U_4(mpj->u.syn.nonce));
+ break;
+ case 16: /* SYN/ACK */
+ ND_PRINT(" hmac 0x%" PRIx64 " nonce 0x%x",
+ GET_BE_U_8(mpj->u.synack.mac),
+ GET_BE_U_4(mpj->u.synack.nonce));
+ break;
+ case 24: {/* ACK */
+ size_t i;
+ ND_PRINT(" hmac 0x");
+ for (i = 0; i < sizeof(mpj->u.ack.mac); ++i)
+ ND_PRINT("%02x", mpj->u.ack.mac[i]);
+ }
+ default:
+ break;
+ }
+ return 1;
+}
+
+static int
+mp_dss_print(netdissect_options *ndo,
+ const u_char *opt, u_int opt_len, u_char flags)
+{
+ const struct mp_dss *mdss = (const struct mp_dss *) opt;
+ uint8_t mdss_flags;
+
+ /* We need the flags, at a minimum. */
+ if (opt_len < 4)
+ return 0;
+
+ if (flags & TH_SYN)
+ return 0;
+
+ mdss_flags = GET_U_1(mdss->flags);
+ if (mdss_flags & MP_DSS_F)
+ ND_PRINT(" fin");
+
+ opt += 4;
+ opt_len -= 4;
+ if (mdss_flags & MP_DSS_A) {
+ /* Ack present */
+ ND_PRINT(" ack ");
+ /*
+ * If the a flag is set, we have an 8-byte ack; if it's
+ * clear, we have a 4-byte ack.
+ */
+ if (mdss_flags & MP_DSS_a) {
+ if (opt_len < 8)
+ return 0;
+ ND_PRINT("%" PRIu64, GET_BE_U_8(opt));
+ opt += 8;
+ opt_len -= 8;
+ } else {
+ if (opt_len < 4)
+ return 0;
+ ND_PRINT("%u", GET_BE_U_4(opt));
+ opt += 4;
+ opt_len -= 4;
+ }
+ }
+
+ if (mdss_flags & MP_DSS_M) {
+ /*
+ * Data Sequence Number (DSN), Subflow Sequence Number (SSN),
+ * Data-Level Length present, and Checksum possibly present.
+ */
+ ND_PRINT(" seq ");
+ /*
+ * If the m flag is set, we have an 8-byte NDS; if it's clear,
+ * we have a 4-byte DSN.
+ */
+ if (mdss_flags & MP_DSS_m) {
+ if (opt_len < 8)
+ return 0;
+ ND_PRINT("%" PRIu64, GET_BE_U_8(opt));
+ opt += 8;
+ opt_len -= 8;
+ } else {
+ if (opt_len < 4)
+ return 0;
+ ND_PRINT("%u", GET_BE_U_4(opt));
+ opt += 4;
+ opt_len -= 4;
+ }
+ if (opt_len < 4)
+ return 0;
+ ND_PRINT(" subseq %u", GET_BE_U_4(opt));
+ opt += 4;
+ opt_len -= 4;
+ if (opt_len < 2)
+ return 0;
+ ND_PRINT(" len %u", GET_BE_U_2(opt));
+ opt += 2;
+ opt_len -= 2;
+
+ /*
+ * The Checksum is present only if negotiated.
+ * If there are at least 2 bytes left, process the next 2
+ * bytes as the Checksum.
+ */
+ if (opt_len >= 2) {
+ ND_PRINT(" csum 0x%x", GET_BE_U_2(opt));
+ opt_len -= 2;
+ }
+ }
+ if (opt_len != 0)
+ return 0;
+ return 1;
+}
+
+static int
+add_addr_print(netdissect_options *ndo,
+ const u_char *opt, u_int opt_len, u_char flags _U_)
+{
+ const struct mp_add_addr *add_addr = (const struct mp_add_addr *) opt;
+
+ if (!(opt_len == 8 || opt_len == 10 || opt_len == 16 || opt_len == 18 ||
+ opt_len == 20 || opt_len == 22 || opt_len == 28 || opt_len == 30))
+ return 0;
+
+ ND_PRINT(" %s",
+ tok2str(mptcp_addr_subecho_bits, "[bad version/echo]",
+ GET_U_1(add_addr->sub_echo) & 0xF));
+ ND_PRINT(" id %u", GET_U_1(add_addr->addr_id));
+ if (opt_len == 8 || opt_len == 10 || opt_len == 16 || opt_len == 18) {
+ ND_PRINT(" %s", GET_IPADDR_STRING(add_addr->u.v4.addr));
+ if (opt_len == 10 || opt_len == 18)
+ ND_PRINT(":%u", GET_BE_U_2(add_addr->u.v4.port));
+ if (opt_len == 16)
+ ND_PRINT(" hmac 0x%" PRIx64, GET_BE_U_8(add_addr->u.v4np.mac));
+ if (opt_len == 18)
+ ND_PRINT(" hmac 0x%" PRIx64, GET_BE_U_8(add_addr->u.v4.mac));
+ }
+
+ if (opt_len == 20 || opt_len == 22 || opt_len == 28 || opt_len == 30) {
+ ND_PRINT(" %s", GET_IP6ADDR_STRING(add_addr->u.v6.addr));
+ if (opt_len == 22 || opt_len == 30)
+ ND_PRINT(":%u", GET_BE_U_2(add_addr->u.v6.port));
+ if (opt_len == 28)
+ ND_PRINT(" hmac 0x%" PRIx64, GET_BE_U_8(add_addr->u.v6np.mac));
+ if (opt_len == 30)
+ ND_PRINT(" hmac 0x%" PRIx64, GET_BE_U_8(add_addr->u.v6.mac));
+ }
+
+ return 1;
+}
+
+static int
+remove_addr_print(netdissect_options *ndo,
+ const u_char *opt, u_int opt_len, u_char flags _U_)
+{
+ const struct mp_remove_addr *remove_addr = (const struct mp_remove_addr *) opt;
+ u_int i;
+
+ if (opt_len < 4)
+ return 0;
+
+ opt_len -= 3;
+ ND_PRINT(" id");
+ for (i = 0; i < opt_len; i++)
+ ND_PRINT(" %u", GET_U_1(remove_addr->addrs_id[i]));
+ return 1;
+}
+
+static int
+mp_prio_print(netdissect_options *ndo,
+ const u_char *opt, u_int opt_len, u_char flags _U_)
+{
+ const struct mp_prio *mpp = (const struct mp_prio *) opt;
+
+ if (opt_len != 3 && opt_len != 4)
+ return 0;
+
+ if (GET_U_1(mpp->sub_b) & MP_PRIO_B)
+ ND_PRINT(" backup");
+ else
+ ND_PRINT(" non-backup");
+ if (opt_len == 4)
+ ND_PRINT(" id %u", GET_U_1(mpp->addr_id));
+
+ return 1;
+}
+
+static int
+mp_fail_print(netdissect_options *ndo,
+ const u_char *opt, u_int opt_len, u_char flags _U_)
+{
+ if (opt_len != 12)
+ return 0;
+
+ ND_PRINT(" seq %" PRIu64, GET_BE_U_8(opt + 4));
+ return 1;
+}
+
+static int
+mp_fast_close_print(netdissect_options *ndo,
+ const u_char *opt, u_int opt_len, u_char flags _U_)
+{
+ if (opt_len != 12)
+ return 0;
+
+ ND_PRINT(" key 0x%" PRIx64, GET_BE_U_8(opt + 4));
+ return 1;
+}
+
+static const struct {
+ const char *name;
+ int (*print)(netdissect_options *, const u_char *, u_int, u_char);
+} mptcp_options[] = {
+ { "capable", mp_capable_print },
+ { "join", mp_join_print },
+ { "dss", mp_dss_print },
+ { "add-addr", add_addr_print },
+ { "rem-addr", remove_addr_print },
+ { "prio", mp_prio_print },
+ { "fail", mp_fail_print },
+ { "fast-close", mp_fast_close_print },
+ { "unknown", dummy_print },
+};
+
+int
+mptcp_print(netdissect_options *ndo,
+ const u_char *cp, u_int len, u_char flags)
+{
+ const struct mptcp_option *opt;
+ u_int subtype;
+
+ ndo->ndo_protocol = "mptcp";
+ if (len < 3)
+ return 0;
+
+ opt = (const struct mptcp_option *) cp;
+ subtype = MPTCP_OPT_SUBTYPE(GET_U_1(opt->sub_etc));
+ subtype = ND_MIN(subtype, MPTCP_SUB_FCLOSE + 1);
+
+ ND_PRINT(" %u", len);
+
+ ND_PRINT(" %s", mptcp_options[subtype].name);
+ return mptcp_options[subtype].print(ndo, cp, len, flags);
+}
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