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-rw-r--r--print-ip6opts.c265
1 files changed, 265 insertions, 0 deletions
diff --git a/print-ip6opts.c b/print-ip6opts.c
new file mode 100644
index 0000000..a78c76d
--- /dev/null
+++ b/print-ip6opts.c
@@ -0,0 +1,265 @@
+/*
+ * Copyright (C) 1998 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 header option printer */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#include "netdissect.h"
+#include "addrtoname.h"
+#include "extract.h"
+
+#include "ip6.h"
+
+static int
+ip6_sopt_print(netdissect_options *ndo, const u_char *bp, int len)
+{
+ int i;
+ int optlen;
+
+ for (i = 0; i < len; i += optlen) {
+ if (GET_U_1(bp + i) == IP6OPT_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;
+
+ switch (GET_U_1(bp + i)) {
+ case IP6OPT_PAD1:
+ ND_PRINT(", pad1");
+ break;
+ case IP6OPT_PADN:
+ if (len - i < IP6OPT_MINLEN) {
+ ND_PRINT(", padn: trunc");
+ goto trunc;
+ }
+ ND_PRINT(", padn");
+ break;
+ default:
+ if (len - i < IP6OPT_MINLEN) {
+ ND_PRINT(", sopt_type %u: trunc)", GET_U_1(bp + i));
+ goto trunc;
+ }
+ ND_PRINT(", sopt_type 0x%02x: len=%u", GET_U_1(bp + i),
+ GET_U_1(bp + i + 1));
+ break;
+ }
+ }
+ return 0;
+
+trunc:
+ return -1;
+}
+
+static int
+ip6_opt_process(netdissect_options *ndo, const u_char *bp, int len,
+ int *found_jumbop, uint32_t *payload_len)
+{
+ int i;
+ int optlen = 0;
+ int found_jumbo = 0;
+ uint32_t jumbolen = 0;
+
+ if (len == 0)
+ return 0;
+ for (i = 0; i < len; i += optlen) {
+ if (GET_U_1(bp + i) == IP6OPT_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;
+
+ switch (GET_U_1(bp + i)) {
+ case IP6OPT_PAD1:
+ if (ndo->ndo_vflag)
+ ND_PRINT("(pad1)");
+ break;
+ case IP6OPT_PADN:
+ if (len - i < IP6OPT_MINLEN) {
+ ND_PRINT("(padn: trunc)");
+ goto trunc;
+ }
+ if (ndo->ndo_vflag)
+ ND_PRINT("(padn)");
+ break;
+ case IP6OPT_ROUTER_ALERT:
+ if (len - i < IP6OPT_RTALERT_LEN) {
+ ND_PRINT("(rtalert: trunc)");
+ goto trunc;
+ }
+ if (GET_U_1(bp + i + 1) != IP6OPT_RTALERT_LEN - 2) {
+ ND_PRINT("(rtalert: invalid len %u)", GET_U_1(bp + i + 1));
+ goto trunc;
+ }
+ if (ndo->ndo_vflag)
+ ND_PRINT("(rtalert: 0x%04x) ", GET_BE_U_2(bp + i + 2));
+ break;
+ case IP6OPT_JUMBO:
+ if (len - i < IP6OPT_JUMBO_LEN) {
+ ND_PRINT("(jumbo: trunc)");
+ goto trunc;
+ }
+ if (GET_U_1(bp + i + 1) != IP6OPT_JUMBO_LEN - 2) {
+ ND_PRINT("(jumbo: invalid len %u)", GET_U_1(bp + i + 1));
+ goto trunc;
+ }
+ jumbolen = GET_BE_U_4(bp + i + 2);
+ if (found_jumbo) {
+ /* More than one Jumbo Payload option */
+ if (ndo->ndo_vflag)
+ ND_PRINT("(jumbo: %u - already seen) ", jumbolen);
+ } else {
+ found_jumbo = 1;
+ if (payload_len == NULL) {
+ /* Not a hop-by-hop option - not valid */
+ if (ndo->ndo_vflag)
+ ND_PRINT("(jumbo: %u - not a hop-by-hop option) ", jumbolen);
+ } else if (*payload_len != 0) {
+ /* Payload length was non-zero - not valid */
+ if (ndo->ndo_vflag)
+ ND_PRINT("(jumbo: %u - payload len != 0) ", jumbolen);
+ } else {
+ /*
+ * This is a hop-by-hop option, and Payload length
+ * was zero in the IPv6 header.
+ */
+ if (jumbolen < 65536) {
+ /* Too short */
+ if (ndo->ndo_vflag)
+ ND_PRINT("(jumbo: %u - < 65536) ", jumbolen);
+ } else {
+ /* OK, this is valid */
+ *found_jumbop = 1;
+ *payload_len = jumbolen;
+ if (ndo->ndo_vflag)
+ ND_PRINT("(jumbo: %u) ", jumbolen);
+ }
+ }
+ }
+ break;
+ case IP6OPT_HOME_ADDRESS:
+ if (len - i < IP6OPT_HOMEADDR_MINLEN) {
+ ND_PRINT("(homeaddr: trunc)");
+ goto trunc;
+ }
+ if (GET_U_1(bp + i + 1) < IP6OPT_HOMEADDR_MINLEN - 2) {
+ ND_PRINT("(homeaddr: invalid len %u)", GET_U_1(bp + i + 1));
+ goto trunc;
+ }
+ if (ndo->ndo_vflag) {
+ ND_PRINT("(homeaddr: %s", GET_IP6ADDR_STRING(bp + i + 2));
+ if (GET_U_1(bp + i + 1) > IP6OPT_HOMEADDR_MINLEN - 2) {
+ if (ip6_sopt_print(ndo, bp + i + IP6OPT_HOMEADDR_MINLEN,
+ (optlen - IP6OPT_HOMEADDR_MINLEN)) == -1)
+ goto trunc;
+ }
+ ND_PRINT(")");
+ }
+ break;
+ default:
+ if (len - i < IP6OPT_MINLEN) {
+ ND_PRINT("(type %u: trunc)", GET_U_1(bp + i));
+ goto trunc;
+ }
+ if (ndo->ndo_vflag)
+ ND_PRINT("(opt_type 0x%02x: len=%u)", GET_U_1(bp + i),
+ GET_U_1(bp + i + 1));
+ break;
+ }
+ }
+ if (ndo->ndo_vflag)
+ ND_PRINT(" ");
+ return 0;
+
+trunc:
+ return -1;
+}
+
+int
+hbhopt_process(netdissect_options *ndo, const u_char *bp, int *found_jumbo,
+ uint32_t *jumbolen)
+{
+ const struct ip6_hbh *dp = (const struct ip6_hbh *)bp;
+ u_int hbhlen = 0;
+
+ ndo->ndo_protocol = "hbhopt";
+ hbhlen = (GET_U_1(dp->ip6h_len) + 1) << 3;
+ ND_TCHECK_LEN(dp, hbhlen);
+ ND_PRINT("HBH ");
+ if (ip6_opt_process(ndo, (const u_char *)dp + sizeof(*dp),
+ hbhlen - sizeof(*dp), found_jumbo, jumbolen) == -1)
+ goto trunc;
+ return hbhlen;
+
+trunc:
+ nd_print_trunc(ndo);
+ return -1;
+}
+
+int
+dstopt_process(netdissect_options *ndo, const u_char *bp)
+{
+ const struct ip6_dest *dp = (const struct ip6_dest *)bp;
+ u_int dstoptlen = 0;
+
+ ndo->ndo_protocol = "dstopt";
+ dstoptlen = (GET_U_1(dp->ip6d_len) + 1) << 3;
+ ND_TCHECK_LEN(dp, dstoptlen);
+ ND_PRINT("DSTOPT ");
+ if (ndo->ndo_vflag) {
+ /*
+ * The Jumbo Payload option is a hop-by-hop option; we don't
+ * honor Jumbo Payload destination options, reporting them
+ * as invalid.
+ */
+ if (ip6_opt_process(ndo, (const u_char *)dp + sizeof(*dp),
+ dstoptlen - sizeof(*dp), NULL, NULL) == -1)
+ goto trunc;
+ }
+
+ return dstoptlen;
+
+trunc:
+ nd_print_trunc(ndo);
+ return -1;
+}
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