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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 {
+ uint8_t kind;
+ uint8_t len;
+ 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 {
+ uint8_t kind;
+ uint8_t len;
+ uint8_t sub_ver;
+ uint8_t flags;
+ uint8_t sender_key[8];
+ uint8_t receiver_key[8];
+};
+
+#define MP_CAPABLE_OPT_VERSION(sub_ver) (((sub_ver) >> 0) & 0xF)
+#define MP_CAPABLE_C 0x80
+#define MP_CAPABLE_S 0x01
+
+struct mp_join {
+ uint8_t kind;
+ uint8_t len;
+ uint8_t sub_b;
+ uint8_t addr_id;
+ union {
+ struct {
+ uint8_t token[4];
+ uint8_t nonce[4];
+ } syn;
+ struct {
+ uint8_t mac[8];
+ uint8_t nonce[4];
+ } synack;
+ struct {
+ uint8_t mac[20];
+ } ack;
+ } u;
+};
+
+#define MP_JOIN_B 0x01
+
+struct mp_dss {
+ uint8_t kind;
+ uint8_t len;
+ uint8_t sub;
+ 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
+
+struct mp_add_addr {
+ uint8_t kind;
+ uint8_t len;
+ uint8_t sub_ipver;
+ uint8_t addr_id;
+ union {
+ struct {
+ uint8_t addr[4];
+ uint8_t port[2];
+ } v4;
+ struct {
+ uint8_t addr[16];
+ uint8_t port[2];
+ } v6;
+ } u;
+};
+
+#define MP_ADD_ADDR_IPVER(sub_ipver) (((sub_ipver) >> 0) & 0xF)
+
+struct mp_remove_addr {
+ uint8_t kind;
+ uint8_t len;
+ uint8_t sub;
+ /* list of addr_id */
+ uint8_t addrs_id;
+};
+
+struct mp_fail {
+ uint8_t kind;
+ uint8_t len;
+ uint8_t sub;
+ uint8_t resv;
+ uint8_t data_seq[8];
+};
+
+struct mp_close {
+ uint8_t kind;
+ uint8_t len;
+ uint8_t sub;
+ uint8_t rsv;
+ uint8_t key[8];
+};
+
+struct mp_prio {
+ uint8_t kind;
+ uint8_t len;
+ uint8_t sub_b;
+ 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;
+
+ if (!(opt_len == 12 && (flags & TH_SYN)) &&
+ !(opt_len == 20 && (flags & (TH_SYN | TH_ACK)) == TH_ACK))
+ return 0;
+
+ if (MP_CAPABLE_OPT_VERSION(mpc->sub_ver) != 0) {
+ ND_PRINT((ndo, " Unknown Version (%d)", MP_CAPABLE_OPT_VERSION(mpc->sub_ver)));
+ return 1;
+ }
+
+ if (mpc->flags & MP_CAPABLE_C)
+ ND_PRINT((ndo, " csum"));
+ ND_PRINT((ndo, " {0x%" PRIx64, EXTRACT_64BITS(mpc->sender_key)));
+ if (opt_len == 20) /* ACK */
+ ND_PRINT((ndo, ",0x%" PRIx64, EXTRACT_64BITS(mpc->receiver_key)));
+ ND_PRINT((ndo, "}"));
+ 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 (mpj->sub_b & MP_JOIN_B)
+ ND_PRINT((ndo, " backup"));
+ ND_PRINT((ndo, " id %u", mpj->addr_id));
+ }
+
+ switch (opt_len) {
+ case 12: /* SYN */
+ ND_PRINT((ndo, " token 0x%x" " nonce 0x%x",
+ EXTRACT_32BITS(mpj->u.syn.token),
+ EXTRACT_32BITS(mpj->u.syn.nonce)));
+ break;
+ case 16: /* SYN/ACK */
+ ND_PRINT((ndo, " hmac 0x%" PRIx64 " nonce 0x%x",
+ EXTRACT_64BITS(mpj->u.synack.mac),
+ EXTRACT_32BITS(mpj->u.synack.nonce)));
+ break;
+ case 24: {/* ACK */
+ size_t i;
+ ND_PRINT((ndo, " hmac 0x"));
+ for (i = 0; i < sizeof(mpj->u.ack.mac); ++i)
+ ND_PRINT((ndo, "%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;
+
+ /* We need the flags, at a minimum. */
+ if (opt_len < 4)
+ return 0;
+
+ if (flags & TH_SYN)
+ return 0;
+
+ if (mdss->flags & MP_DSS_F)
+ ND_PRINT((ndo, " fin"));
+
+ opt += 4;
+ opt_len -= 4;
+ if (mdss->flags & MP_DSS_A) {
+ /* Ack present */
+ ND_PRINT((ndo, " 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((ndo, "%" PRIu64, EXTRACT_64BITS(opt)));
+ opt += 8;
+ opt_len -= 8;
+ } else {
+ if (opt_len < 4)
+ return 0;
+ ND_PRINT((ndo, "%u", EXTRACT_32BITS(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((ndo, " 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((ndo, "%" PRIu64, EXTRACT_64BITS(opt)));
+ opt += 8;
+ opt_len -= 8;
+ } else {
+ if (opt_len < 4)
+ return 0;
+ ND_PRINT((ndo, "%u", EXTRACT_32BITS(opt)));
+ opt += 4;
+ opt_len -= 4;
+ }
+ if (opt_len < 4)
+ return 0;
+ ND_PRINT((ndo, " subseq %u", EXTRACT_32BITS(opt)));
+ opt += 4;
+ opt_len -= 4;
+ if (opt_len < 2)
+ return 0;
+ ND_PRINT((ndo, " len %u", EXTRACT_16BITS(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((ndo, " csum 0x%x", EXTRACT_16BITS(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;
+ u_int ipver = MP_ADD_ADDR_IPVER(add_addr->sub_ipver);
+
+ if (!((opt_len == 8 || opt_len == 10) && ipver == 4) &&
+ !((opt_len == 20 || opt_len == 22) && ipver == 6))
+ return 0;
+
+ ND_PRINT((ndo, " id %u", add_addr->addr_id));
+ switch (ipver) {
+ case 4:
+ ND_PRINT((ndo, " %s", ipaddr_string(ndo, add_addr->u.v4.addr)));
+ if (opt_len == 10)
+ ND_PRINT((ndo, ":%u", EXTRACT_16BITS(add_addr->u.v4.port)));
+ break;
+ case 6:
+ ND_PRINT((ndo, " %s", ip6addr_string(ndo, add_addr->u.v6.addr)));
+ if (opt_len == 22)
+ ND_PRINT((ndo, ":%u", EXTRACT_16BITS(add_addr->u.v6.port)));
+ break;
+ default:
+ return 0;
+ }
+
+ 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;
+ const uint8_t *addr_id = &remove_addr->addrs_id;
+
+ if (opt_len < 4)
+ return 0;
+
+ opt_len -= 3;
+ ND_PRINT((ndo, " id"));
+ while (opt_len--)
+ ND_PRINT((ndo, " %u", *addr_id++));
+ 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 (mpp->sub_b & MP_PRIO_B)
+ ND_PRINT((ndo, " backup"));
+ else
+ ND_PRINT((ndo, " non-backup"));
+ if (opt_len == 4)
+ ND_PRINT((ndo, " id %u", 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((ndo, " seq %" PRIu64, EXTRACT_64BITS(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((ndo, " key 0x%" PRIx64, EXTRACT_64BITS(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;
+
+ if (len < 3)
+ return 0;
+
+ opt = (const struct mptcp_option *) cp;
+ subtype = min(MPTCP_OPT_SUBTYPE(opt->sub_etc), MPTCP_SUB_FCLOSE + 1);
+
+ ND_PRINT((ndo, " %s", mptcp_options[subtype].name));
+ return mptcp_options[subtype].print(ndo, cp, len, flags);
+}
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