#define icmp_data icmp_dun.id_data
};
-#define ICMP_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
#define ICMP_UNREACH_PRECEDENCE_CUTOFF 15 /* precedence cutoff */
#endif
-/* rfc4950 */
-#define MPLS_STACK_ENTRY_OBJECT_CLASS 1
-/* rfc5837 */
-#define INTERFACE_INFORMATION_OBJECT_CLASS 2
-
/* Most of the icmp types */
static const struct tok icmp2str[] = {
{ ICMP_ECHOREPLY, "echo reply" },
};
/*
- * 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];
};
+/*
+ * 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.
+ *
+ * Class 2 was used for an "Extended Payload Object Class", which
+ * contained bytes of the payload beyond the first 128 bytes, in
+ * draft-bonica-icmp-mpls-02; it was reassigned to an "Interface
+ * Information Object" in RFC 5837.
+ */
+
+/* rfc4950 */
+#define MPLS_STACK_ENTRY_OBJECT_CLASS 1
+/* rfc5837 */
+#define INTERFACE_INFORMATION_OBJECT_CLASS 2
+
struct icmp_multipart_ext_object_header_t {
nd_uint16_t length;
nd_uint8_t class_num;
{ 0, NULL}
};
+/* rfc5837 */
+static const struct tok icmp_interface_identification_role_values[] = {
+ { 0, "the IP interface upon which a datagram arrived"},
+ { 1, "the sub-IP component of an IP interface upon which a datagram arrived"},
+ { 2, "the IP interface through which the datagram would have been forwarded had it been forwardable"},
+ { 3, "the IP next hop to which the datagram would have been forwarded"},
+ { 0, NULL }
+};
+
+/*
+Interface IP Address Sub-Object
+0 31
++-------+-------+-------+-------+
+| AFI | Reserved |
++-------+-------+-------+-------+
+| IP Address ....
+*/
+struct icmp_interface_identification_ipaddr_subobject_t {
+ nd_uint16_t afi;
+ nd_uint16_t reserved;
+ nd_uint32_t ip_addr;
+};
+
+/*
+Interface Name Sub-Object
+octet 0 1 63
+ +--------+-----------................-----------------+
+ | length | interface name octets 1-63 |
+ +--------+-----------................-----------------+
+*/
+struct icmp_interface_identification_ifname_subobject_t {
+ nd_uint8_t length;
+ nd_byte if_name[63];
+};
+
+
/* prototypes */
const char *icmp_tstamp_print(u_int);
const uint8_t *obj_tptr;
uint32_t raw_label;
const struct icmp_multipart_ext_object_header_t *icmp_multipart_ext_object_header;
+ u_int interface_role, if_index_flag, ipaddr_flag, name_flag, mtu_flag;
+ const uint8_t *offset;
+ const struct icmp_interface_identification_ipaddr_subobject_t *ipaddr_subobj;
+ const struct icmp_interface_identification_ifname_subobject_t *ifname_subobj;
u_int hlen, mtu, obj_tlen, obj_class_num, obj_ctype;
uint16_t dport;
char buf[MAXHOSTNAMELEN + 100];
* Sanity checking of the header.
*/
if (ICMP_EXT_EXTRACT_VERSION(*(ext_dp->icmp_ext_version_res)) !=
- ICMP_MPLS_EXT_VERSION) {
+ ICMP_EXT_VERSION) {
ND_PRINT(" packet not supported");
return;
}
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);
}
break;
- /*
- * FIXME those are the defined objects that lack a decoder
- * you are welcome to contribute code ;-)
- */
- case 2:
+ case INTERFACE_INFORMATION_OBJECT_CLASS:
+ /*
+ Ctype in a INTERFACE_INFORMATION_OBJECT_CLASS object:
+
+ Bit 0 1 2 3 4 5 6 7
+ +-------+-------+-------+-------+-------+-------+-------+-------+
+ | Interface Role| Rsvd1 | Rsvd2 |ifIndex| IPAddr| name | MTU |
+ +-------+-------+-------+-------+-------+-------+-------+-------+
+ */
+ interface_role = (obj_ctype & 0xc0) >> 6;
+ if_index_flag = (obj_ctype & 0x8) >> 3;
+ ipaddr_flag = (obj_ctype & 0x4) >> 2;
+ name_flag = (obj_ctype & 0x2) >> 1;
+ mtu_flag = (obj_ctype & 0x1);
+
+ ND_PRINT("\n\t\t This object describes %s",
+ tok2str(icmp_interface_identification_role_values,
+ "an unknown interface role",interface_role));
+
+ offset = obj_tptr;
+
+ if (if_index_flag) {
+ ND_PRINT("\n\t\t Interface Index: %u", GET_BE_U_4(offset));
+ offset += 4;
+ }
+ if (ipaddr_flag) {
+ ND_PRINT("\n\t\t IP Address sub-object: ");
+ ipaddr_subobj = (const struct icmp_interface_identification_ipaddr_subobject_t *) offset;
+ switch (GET_BE_U_2(ipaddr_subobj->afi)) {
+ case 1:
+ ND_PRINT("%s", GET_IPADDR_STRING(ipaddr_subobj->ip_addr));
+ offset += 4;
+ break;
+ case 2:
+ ND_PRINT("%s", GET_IP6ADDR_STRING(ipaddr_subobj->ip_addr));
+ offset += 16;
+ break;
+ default:
+ ND_PRINT("Unknown Address Family Identifier");
+ return;
+ }
+ offset += 4;
+ }
+ if (name_flag) {
+ uint8_t inft_name_length_field;
+
+ ifname_subobj = (const struct icmp_interface_identification_ifname_subobject_t *) offset;
+ inft_name_length_field = GET_U_1(ifname_subobj->length);
+ ND_PRINT("\n\t\t Interface Name");
+ if (inft_name_length_field % 4 != 0) {
+ ND_PRINT(" [length %u != N x 4]", inft_name_length_field);
+ nd_print_invalid(ndo);
+ offset += inft_name_length_field;
+ break;
+ }
+ if (inft_name_length_field > 64) {
+ ND_PRINT(" [length %u > 64]", inft_name_length_field);
+ nd_print_invalid(ndo);
+ offset += inft_name_length_field;
+ break;
+ }
+ ND_PRINT(", length %u: ", inft_name_length_field);
+ nd_printjnp(ndo, ifname_subobj->if_name,
+ inft_name_length_field - 1);
+ offset += inft_name_length_field;
+ }
+ if (mtu_flag) {
+ ND_PRINT("\n\t\t MTU: %u", GET_BE_U_4(offset));
+ offset += 4;
+ }
+ break;
+
default:
print_unknown_data(ndo, obj_tptr, "\n\t ", obj_tlen);
break;
projects / tcpdump / blobdiff