/* \summary: Internet Control Message Protocol (ICMP) printer */
-#ifdef HAVE_CONFIG_H
#include <config.h>
-#endif
#include "netdissect-stdinc.h"
#define icmp_data icmp_dun.id_data
};
-#define ICMP_MPLS_EXT_EXTRACT_VERSION(x) (((x)&0xf0)>>4)
-#define ICMP_MPLS_EXT_VERSION 2
-
/*
* Lower bounds on packet lengths for various types.
* For the error advice packets must first insure that the
((type) == ICMP_UNREACH || (type) == ICMP_SOURCEQUENCH || \
(type) == ICMP_REDIRECT || (type) == ICMP_TIMXCEED || \
(type) == ICMP_PARAMPROB)
-#define ICMP_MPLS_EXT_TYPE(type) \
+#define ICMP_MULTIPART_EXT_TYPE(type) \
((type) == ICMP_UNREACH || \
(type) == ICMP_TIMXCEED || \
(type) == ICMP_PARAMPROB)
};
/*
- * draft-bonica-internet-icmp-08
+ * RFC 4884 - Extended ICMP to Support Multi-Part Messages
+ *
+ * This is a general extension mechanism, based on the mechanism
+ * in draft-bonica-icmp-mpls-02 ICMP Extensions for MultiProtocol
+ * Label Switching.
*
* The Destination Unreachable, Time Exceeded
* and Parameter Problem messages are slightly changed as per
- * the above draft. A new Length field gets added to give
+ * the above RFC. A new Length field gets added to give
* the caller an idea about the length of the piggybacked
- * IP packet before the MPLS extension header starts.
+ * IP packet before the extension header starts.
*
* The Length field represents length of the padded "original datagram"
* field measured in 32-bit words.
nd_byte icmp_ext_data[1];
};
-struct icmp_mpls_ext_object_header_t {
+/*
+ * Extract version from the first octet of icmp_ext_version_res.
+ */
+#define ICMP_EXT_EXTRACT_VERSION(x) (((x)&0xf0)>>4)
+
+/*
+ * Current version.
+ */
+#define ICMP_EXT_VERSION 2
+
+/*
+ * Extension object class numbers.
+ *
+ * Class 1 dates back to draft-bonica-icmp-mpls-02.
+ */
+
+/* rfc4950 */
+#define MPLS_STACK_ENTRY_OBJECT_CLASS 1
+
+struct icmp_multipart_ext_object_header_t {
nd_uint16_t length;
nd_uint8_t class_num;
nd_uint8_t ctype;
};
-static const struct tok icmp_mpls_ext_obj_values[] = {
+static const struct tok icmp_multipart_ext_obj_values[] = {
{ 1, "MPLS Stack Entry" },
- { 2, "Extended Payload" },
+ { 2, "Interface Identification" },
{ 0, NULL}
};
const struct udphdr *ouh;
const uint8_t *obj_tptr;
uint32_t raw_label;
- const struct icmp_mpls_ext_object_header_t *icmp_mpls_ext_object_header;
+ const struct icmp_multipart_ext_object_header_t *icmp_multipart_ext_object_header;
u_int hlen, mtu, obj_tlen, obj_class_num, obj_ctype;
uint16_t dport;
char buf[MAXHOSTNAMELEN + 100];
ndo->ndo_protocol = "icmp";
/*
- * Attempt to decode the MPLS extensions only for some ICMP types.
+ * Attempt to decode multi-part message extensions (rfc4884) only for some ICMP types.
*/
- if (ndo->ndo_vflag >= 1 && plen > ICMP_EXTD_MINLEN && ICMP_MPLS_EXT_TYPE(icmp_type)) {
+ if (ndo->ndo_vflag >= 1 && plen > ICMP_EXTD_MINLEN && ICMP_MULTIPART_EXT_TYPE(icmp_type)) {
ND_TCHECK_SIZE(ext_dp);
/*
- * Check first if the mpls extension header shows a non-zero length.
+ * Check first if the multi-part extension header shows a non-zero length.
* If the length field is not set then silently verify the checksum
* to check if an extension header is present. This is expedient,
* however not all implementations set the length field proper.
}
}
- ND_PRINT("\n\tMPLS extension v%u",
- ICMP_MPLS_EXT_EXTRACT_VERSION(*(ext_dp->icmp_ext_version_res)));
+ ND_PRINT("\n\tICMP Multi-Part extension v%u",
+ ICMP_EXT_EXTRACT_VERSION(*(ext_dp->icmp_ext_version_res)));
/*
* Sanity checking of the header.
*/
- if (ICMP_MPLS_EXT_EXTRACT_VERSION(*(ext_dp->icmp_ext_version_res)) !=
- ICMP_MPLS_EXT_VERSION) {
+ if (ICMP_EXT_EXTRACT_VERSION(*(ext_dp->icmp_ext_version_res)) !=
+ ICMP_EXT_VERSION) {
ND_PRINT(" packet not supported");
return;
}
hlen -= 4; /* subtract common header size */
obj_tptr = (const uint8_t *)ext_dp->icmp_ext_data;
- while (hlen > sizeof(struct icmp_mpls_ext_object_header_t)) {
+ while (hlen > sizeof(struct icmp_multipart_ext_object_header_t)) {
- icmp_mpls_ext_object_header = (const struct icmp_mpls_ext_object_header_t *)obj_tptr;
- ND_TCHECK_SIZE(icmp_mpls_ext_object_header);
- obj_tlen = GET_BE_U_2(icmp_mpls_ext_object_header->length);
- obj_class_num = GET_U_1(icmp_mpls_ext_object_header->class_num);
- obj_ctype = GET_U_1(icmp_mpls_ext_object_header->ctype);
- obj_tptr += sizeof(struct icmp_mpls_ext_object_header_t);
+ icmp_multipart_ext_object_header = (const struct icmp_multipart_ext_object_header_t *)obj_tptr;
+ ND_TCHECK_SIZE(icmp_multipart_ext_object_header);
+ obj_tlen = GET_BE_U_2(icmp_multipart_ext_object_header->length);
+ obj_class_num = GET_U_1(icmp_multipart_ext_object_header->class_num);
+ obj_ctype = GET_U_1(icmp_multipart_ext_object_header->ctype);
+ obj_tptr += sizeof(struct icmp_multipart_ext_object_header_t);
ND_PRINT("\n\t %s Object (%u), Class-Type: %u, length %u",
- tok2str(icmp_mpls_ext_obj_values,"unknown",obj_class_num),
+ tok2str(icmp_multipart_ext_obj_values,"unknown",obj_class_num),
obj_class_num,
obj_ctype,
obj_tlen);
- hlen-=sizeof(struct icmp_mpls_ext_object_header_t); /* length field includes tlv header */
+ hlen-=sizeof(struct icmp_multipart_ext_object_header_t); /* length field includes tlv header */
/* infinite loop protection */
if ((obj_class_num == 0) ||
- (obj_tlen < sizeof(struct icmp_mpls_ext_object_header_t))) {
+ (obj_tlen < sizeof(struct icmp_multipart_ext_object_header_t))) {
return;
}
- obj_tlen-=sizeof(struct icmp_mpls_ext_object_header_t);
+ obj_tlen-=sizeof(struct icmp_multipart_ext_object_header_t);
switch (obj_class_num) {
- case 1:
+ case MPLS_STACK_ENTRY_OBJECT_CLASS:
switch(obj_ctype) {
case 1:
raw_label = GET_BE_U_4(obj_tptr);
- ND_PRINT("\n\t label %u, exp %u", MPLS_LABEL(raw_label), MPLS_EXP(raw_label));
+ ND_PRINT("\n\t label %u, tc %u", MPLS_LABEL(raw_label), MPLS_TC(raw_label));
if (MPLS_STACK(raw_label))
ND_PRINT(", [S]");
ND_PRINT(", ttl %u", MPLS_TTL(raw_label));
}
break;
- /*
- * FIXME those are the defined objects that lack a decoder
- * you are welcome to contribute code ;-)
- */
- case 2:
default:
print_unknown_data(ndo, obj_tptr, "\n\t ", obj_tlen);
break;
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