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-rw-r--r--print-mobility.c334
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diff --git a/print-mobility.c b/print-mobility.c
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+/*
+ * Copyright (C) 2002 WIDE Project.
+ * All rights reserved.
+ *
+ * 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 project nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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: IPv6 mobility printer */
+/* RFC 3775 */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#include "netdissect.h"
+#include "addrtoname.h"
+#include "extract.h"
+
+#include "ip6.h"
+
+
+/* Mobility header */
+struct ip6_mobility {
+ nd_uint8_t ip6m_pproto; /* following payload protocol (for PG) */
+ nd_uint8_t ip6m_len; /* length in units of 8 octets */
+ nd_uint8_t ip6m_type; /* message type */
+ nd_uint8_t reserved; /* reserved */
+ nd_uint16_t ip6m_cksum; /* sum of IPv6 pseudo-header and MH */
+ union {
+ nd_uint16_t ip6m_un_data16[1]; /* type-specific field */
+ nd_uint8_t ip6m_un_data8[2]; /* type-specific field */
+ } ip6m_dataun;
+};
+
+#define ip6m_data16 ip6m_dataun.ip6m_un_data16
+#define ip6m_data8 ip6m_dataun.ip6m_un_data8
+
+#define IP6M_MINLEN 8
+
+/* https://www.iana.org/assignments/mobility-parameters/mobility-parameters.xhtml */
+
+/* message type */
+#define IP6M_BINDING_REQUEST 0 /* Binding Refresh Request */
+#define IP6M_HOME_TEST_INIT 1 /* Home Test Init */
+#define IP6M_CAREOF_TEST_INIT 2 /* Care-of Test Init */
+#define IP6M_HOME_TEST 3 /* Home Test */
+#define IP6M_CAREOF_TEST 4 /* Care-of Test */
+#define IP6M_BINDING_UPDATE 5 /* Binding Update */
+#define IP6M_BINDING_ACK 6 /* Binding Acknowledgement */
+#define IP6M_BINDING_ERROR 7 /* Binding Error */
+#define IP6M_MAX 7
+
+static const struct tok ip6m_str[] = {
+ { IP6M_BINDING_REQUEST, "BRR" },
+ { IP6M_HOME_TEST_INIT, "HoTI" },
+ { IP6M_CAREOF_TEST_INIT, "CoTI" },
+ { IP6M_HOME_TEST, "HoT" },
+ { IP6M_CAREOF_TEST, "CoT" },
+ { IP6M_BINDING_UPDATE, "BU" },
+ { IP6M_BINDING_ACK, "BA" },
+ { IP6M_BINDING_ERROR, "BE" },
+ { 0, NULL }
+};
+
+static const unsigned ip6m_hdrlen[IP6M_MAX + 1] = {
+ IP6M_MINLEN, /* IP6M_BINDING_REQUEST */
+ IP6M_MINLEN + 8, /* IP6M_HOME_TEST_INIT */
+ IP6M_MINLEN + 8, /* IP6M_CAREOF_TEST_INIT */
+ IP6M_MINLEN + 16, /* IP6M_HOME_TEST */
+ IP6M_MINLEN + 16, /* IP6M_CAREOF_TEST */
+ IP6M_MINLEN + 4, /* IP6M_BINDING_UPDATE */
+ IP6M_MINLEN + 4, /* IP6M_BINDING_ACK */
+ IP6M_MINLEN + 16, /* IP6M_BINDING_ERROR */
+};
+
+/* Mobility Header Options */
+#define IP6MOPT_MINLEN 2
+#define IP6MOPT_PAD1 0x0 /* Pad1 */
+#define IP6MOPT_PADN 0x1 /* PadN */
+#define IP6MOPT_REFRESH 0x2 /* Binding Refresh Advice */
+#define IP6MOPT_REFRESH_MINLEN 4
+#define IP6MOPT_ALTCOA 0x3 /* Alternate Care-of Address */
+#define IP6MOPT_ALTCOA_MINLEN 18
+#define IP6MOPT_NONCEID 0x4 /* Nonce Indices */
+#define IP6MOPT_NONCEID_MINLEN 6
+#define IP6MOPT_AUTH 0x5 /* Binding Authorization Data */
+#define IP6MOPT_AUTH_MINLEN 12
+
+static const struct tok ip6m_binding_update_bits [] = {
+ { 0x08, "A" },
+ { 0x04, "H" },
+ { 0x02, "L" },
+ { 0x01, "K" },
+ { 0, NULL }
+};
+
+static int
+mobility_opt_print(netdissect_options *ndo,
+ const u_char *bp, const unsigned len)
+{
+ unsigned i, optlen;
+
+ for (i = 0; i < len; i += optlen) {
+ if (GET_U_1(bp + i) == IP6MOPT_PAD1)
+ optlen = 1;
+ else {
+ if (i + 1 < len) {
+ optlen = GET_U_1(bp + i + 1) + 2;
+ }
+ else
+ goto trunc;
+ }
+ if (i + optlen > len)
+ goto trunc;
+ ND_TCHECK_1(bp + i + optlen);
+
+ switch (GET_U_1(bp + i)) {
+ case IP6MOPT_PAD1:
+ ND_PRINT("(pad1)");
+ break;
+ case IP6MOPT_PADN:
+ if (len - i < IP6MOPT_MINLEN) {
+ ND_PRINT("(padn: trunc)");
+ goto trunc;
+ }
+ ND_PRINT("(padn)");
+ break;
+ case IP6MOPT_REFRESH:
+ if (len - i < IP6MOPT_REFRESH_MINLEN) {
+ ND_PRINT("(refresh: trunc)");
+ goto trunc;
+ }
+ /* units of 4 secs */
+ ND_PRINT("(refresh: %u)",
+ GET_BE_U_2(bp + i + 2) << 2);
+ break;
+ case IP6MOPT_ALTCOA:
+ if (len - i < IP6MOPT_ALTCOA_MINLEN) {
+ ND_PRINT("(altcoa: trunc)");
+ goto trunc;
+ }
+ ND_PRINT("(alt-CoA: %s)", GET_IP6ADDR_STRING(bp + i + 2));
+ break;
+ case IP6MOPT_NONCEID:
+ if (len - i < IP6MOPT_NONCEID_MINLEN) {
+ ND_PRINT("(ni: trunc)");
+ goto trunc;
+ }
+ ND_PRINT("(ni: ho=0x%04x co=0x%04x)",
+ GET_BE_U_2(bp + i + 2),
+ GET_BE_U_2(bp + i + 4));
+ break;
+ case IP6MOPT_AUTH:
+ if (len - i < IP6MOPT_AUTH_MINLEN) {
+ ND_PRINT("(auth: trunc)");
+ goto trunc;
+ }
+ ND_PRINT("(auth)");
+ break;
+ default:
+ if (len - i < IP6MOPT_MINLEN) {
+ ND_PRINT("(sopt_type %u: trunc)",
+ GET_U_1(bp + i));
+ goto trunc;
+ }
+ ND_PRINT("(type-0x%02x: len=%u)", GET_U_1(bp + i),
+ GET_U_1(bp + i + 1));
+ break;
+ }
+ }
+ return 0;
+
+trunc:
+ return 1;
+}
+
+/*
+ * Mobility Header
+ */
+int
+mobility_print(netdissect_options *ndo,
+ const u_char *bp, const u_char *bp2 _U_)
+{
+ const struct ip6_mobility *mh;
+ const u_char *ep;
+ unsigned mhlen, hlen;
+ uint8_t type;
+
+ ndo->ndo_protocol = "mobility";
+ mh = (const struct ip6_mobility *)bp;
+
+ /* 'ep' points to the end of available data. */
+ ep = ndo->ndo_snapend;
+
+ if (!ND_TTEST_1(mh->ip6m_len)) {
+ /*
+ * There's not enough captured data to include the
+ * mobility header length.
+ *
+ * Our caller expects us to return the length, however,
+ * so return a value that will run to the end of the
+ * captured data.
+ *
+ * XXX - "ip6_print()" doesn't do anything with the
+ * returned length, however, as it breaks out of the
+ * header-processing loop.
+ */
+ mhlen = (unsigned)(ep - bp);
+ goto trunc;
+ }
+ mhlen = (GET_U_1(mh->ip6m_len) + 1) << 3;
+
+ /* XXX ip6m_cksum */
+
+ type = GET_U_1(mh->ip6m_type);
+ if (type <= IP6M_MAX && mhlen < ip6m_hdrlen[type]) {
+ ND_PRINT("(header length %u is too small for type %u)", mhlen, type);
+ goto trunc;
+ }
+ ND_PRINT("mobility: %s", tok2str(ip6m_str, "type-#%u", type));
+ switch (type) {
+ case IP6M_BINDING_REQUEST:
+ hlen = IP6M_MINLEN;
+ break;
+ case IP6M_HOME_TEST_INIT:
+ case IP6M_CAREOF_TEST_INIT:
+ hlen = IP6M_MINLEN;
+ if (ndo->ndo_vflag) {
+ ND_PRINT(" %s Init Cookie=%08x:%08x",
+ type == IP6M_HOME_TEST_INIT ? "Home" : "Care-of",
+ GET_BE_U_4(bp + hlen),
+ GET_BE_U_4(bp + hlen + 4));
+ }
+ hlen += 8;
+ break;
+ case IP6M_HOME_TEST:
+ case IP6M_CAREOF_TEST:
+ ND_PRINT(" nonce id=0x%x", GET_BE_U_2(mh->ip6m_data16[0]));
+ hlen = IP6M_MINLEN;
+ if (ndo->ndo_vflag) {
+ ND_PRINT(" %s Init Cookie=%08x:%08x",
+ type == IP6M_HOME_TEST ? "Home" : "Care-of",
+ GET_BE_U_4(bp + hlen),
+ GET_BE_U_4(bp + hlen + 4));
+ }
+ hlen += 8;
+ if (ndo->ndo_vflag) {
+ ND_PRINT(" %s Keygen Token=%08x:%08x",
+ type == IP6M_HOME_TEST ? "Home" : "Care-of",
+ GET_BE_U_4(bp + hlen),
+ GET_BE_U_4(bp + hlen + 4));
+ }
+ hlen += 8;
+ break;
+ case IP6M_BINDING_UPDATE:
+ {
+ int bits;
+ ND_PRINT(" seq#=%u", GET_BE_U_2(mh->ip6m_data16[0]));
+ hlen = IP6M_MINLEN;
+ ND_TCHECK_2(bp + hlen);
+ bits = (GET_U_1(bp + hlen) & 0xf0) >> 4;
+ if (bits) {
+ ND_PRINT(" ");
+ ND_PRINT("%s",
+ bittok2str_nosep(ip6m_binding_update_bits,
+ "bits-#0x%x", bits));
+ }
+ /* Reserved (4bits) */
+ hlen += 1;
+ /* Reserved (8bits) */
+ hlen += 1;
+ /* units of 4 secs */
+ ND_PRINT(" lifetime=%u", GET_BE_U_2(bp + hlen) << 2);
+ hlen += 2;
+ break;
+ }
+ case IP6M_BINDING_ACK:
+ ND_PRINT(" status=%u", GET_U_1(mh->ip6m_data8[0]));
+ if (GET_U_1(mh->ip6m_data8[1]) & 0x80)
+ ND_PRINT(" K");
+ /* Reserved (7bits) */
+ hlen = IP6M_MINLEN;
+ ND_PRINT(" seq#=%u", GET_BE_U_2(bp + hlen));
+ hlen += 2;
+ /* units of 4 secs */
+ ND_PRINT(" lifetime=%u", GET_BE_U_2(bp + hlen) << 2);
+ hlen += 2;
+ break;
+ case IP6M_BINDING_ERROR:
+ ND_PRINT(" status=%u", GET_U_1(mh->ip6m_data8[0]));
+ /* Reserved */
+ hlen = IP6M_MINLEN;
+ ND_PRINT(" homeaddr %s", GET_IP6ADDR_STRING(bp + hlen));
+ hlen += 16;
+ break;
+ default:
+ ND_PRINT(" len=%u", GET_U_1(mh->ip6m_len));
+ return(mhlen);
+ break;
+ }
+ if (ndo->ndo_vflag)
+ if (mobility_opt_print(ndo, bp + hlen, mhlen - hlen))
+ goto trunc;
+
+ return(mhlen);
+
+ trunc:
+ nd_print_trunc(ndo);
+ return(-1);
+}
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