Adding upstream version 4.99.4.upstream/4.99.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 174 insertions, 0 deletions

diff --git a/print-mpls.c b/print-mpls.c
new file mode 100644
index 0000000..c9be496
--- /dev/null
+++ b/print-mpls.c
@@ -0,0 +1,174 @@
+/*
+ * Copyright (C) 2001 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: Multi-Protocol Label Switching (MPLS) printer */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
+#include "extract.h"
+#include "mpls.h"
+
+static const char *mpls_labelname[] = {
+/*0*/	"IPv4 explicit NULL", "router alert", "IPv6 explicit NULL",
+	"implicit NULL", "rsvd",
+/*5*/	"rsvd", "rsvd", "rsvd", "rsvd", "rsvd",
+/*10*/	"rsvd", "rsvd", "rsvd", "rsvd", "rsvd",
+/*15*/	"rsvd",
+};
+
+enum mpls_packet_type {
+	PT_UNKNOWN,
+	PT_IPV4,
+	PT_IPV6,
+	PT_OSI
+};
+
+/*
+ * RFC3032: MPLS label stack encoding
+ */
+void
+mpls_print(netdissect_options *ndo, const u_char *bp, u_int length)
+{
+	const u_char *p;
+	uint32_t label_entry;
+	uint16_t label_stack_depth = 0;
+	uint8_t first;
+	enum mpls_packet_type pt = PT_UNKNOWN;
+
+	ndo->ndo_protocol = "mpls";
+	p = bp;
+	nd_print_protocol_caps(ndo);
+	do {
+		if (length < sizeof(label_entry))
+			goto invalid;
+		label_entry = GET_BE_U_4(p);
+		ND_PRINT("%s(label %u",
+		       (label_stack_depth && ndo->ndo_vflag) ? "\n\t" : " ",
+			MPLS_LABEL(label_entry));
+		label_stack_depth++;
+		if (ndo->ndo_vflag &&
+		    MPLS_LABEL(label_entry) < sizeof(mpls_labelname) / sizeof(mpls_labelname[0]))
+			ND_PRINT(" (%s)", mpls_labelname[MPLS_LABEL(label_entry)]);
+		ND_PRINT(", tc %u", MPLS_TC(label_entry));
+		if (MPLS_STACK(label_entry))
+			ND_PRINT(", [S]");
+		ND_PRINT(", ttl %u)", MPLS_TTL(label_entry));
+
+		p += sizeof(label_entry);
+		length -= sizeof(label_entry);
+	} while (!MPLS_STACK(label_entry));
+
+	/*
+	 * Try to figure out the packet type.
+	 */
+	switch (MPLS_LABEL(label_entry)) {
+
+	case 0:	/* IPv4 explicit NULL label */
+	case 3:	/* IPv4 implicit NULL label */
+		pt = PT_IPV4;
+		break;
+
+	case 2:	/* IPv6 explicit NULL label */
+		pt = PT_IPV6;
+		break;
+
+	default:
+		/*
+		 * Generally there's no indication of protocol in MPLS label
+		 * encoding.
+		 *
+		 * However, draft-hsmit-isis-aal5mux-00.txt describes a
+		 * technique for encapsulating IS-IS and IP traffic on the
+		 * same ATM virtual circuit; you look at the first payload
+		 * byte to determine the network layer protocol, based on
+		 * the fact that
+		 *
+		 *	1) the first byte of an IP header is 0x45-0x4f
+		 *	   for IPv4 and 0x60-0x6f for IPv6;
+		 *
+		 *	2) the first byte of an OSI CLNP packet is 0x81,
+		 *	   the first byte of an OSI ES-IS packet is 0x82,
+		 *	   and the first byte of an OSI IS-IS packet is
+		 *	   0x83;
+		 *
+		 * so the network layer protocol can be inferred from the
+		 * first byte of the packet, if the protocol is one of the
+		 * ones listed above.
+		 *
+		 * Cisco sends control-plane traffic MPLS-encapsulated in
+		 * this fashion.
+		 */
+		if (length < 1) {
+			/* nothing to print */
+			return;
+		}
+		first = GET_U_1(p);
+		pt =
+			(first >= 0x45 && first <= 0x4f) ? PT_IPV4 :
+			(first >= 0x60 && first <= 0x6f) ? PT_IPV6 :
+			(first >= 0x81 && first <= 0x83) ? PT_OSI :
+			/* ok bail out - we did not figure out what it is*/
+			PT_UNKNOWN;
+	}
+
+	/*
+	 * Print the payload.
+	 */
+	switch (pt) {
+	case PT_UNKNOWN:
+		if (!ndo->ndo_suppress_default_print)
+			ND_DEFAULTPRINT(p, length);
+		break;
+
+	case PT_IPV4:
+		ND_PRINT(ndo->ndo_vflag ? "\n\t" : " ");
+		ip_print(ndo, p, length);
+		break;
+
+	case PT_IPV6:
+		ND_PRINT(ndo->ndo_vflag ? "\n\t" : " ");
+		ip6_print(ndo, p, length);
+		break;
+
+	case PT_OSI:
+		ND_PRINT(ndo->ndo_vflag ? "\n\t" : " ");
+		isoclns_print(ndo, p, length);
+		break;
+	}
+	return;
+
+invalid:
+	nd_print_invalid(ndo);
+	ND_TCHECK_LEN(p, length);
+}