+
+ /* ndo_protocol reassignment after ip_print() call */
+ ndo->ndo_protocol = "icmp";
+
+ /*
+ * Attempt to decode multi-part message extensions (rfc4884) only for some ICMP types.
+ */
+ if (ndo->ndo_vflag >= 1 && plen > ICMP_EXTD_MINLEN && ICMP_MULTIPART_EXT_TYPE(icmp_type)) {
+
+ ND_TCHECK_SIZE(ext_dp);
+
+ /*
+ * 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.
+ */
+ if (GET_U_1(ext_dp->icmp_length) == 0 &&
+ ND_TTEST_LEN(ext_dp->icmp_ext_version_res, plen - ICMP_EXTD_MINLEN)) {
+ vec[0].ptr = (const uint8_t *)(const void *)&ext_dp->icmp_ext_version_res;
+ vec[0].len = plen - ICMP_EXTD_MINLEN;
+ if (in_cksum(vec, 1)) {
+ return;
+ }
+ }
+
+ 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_EXT_EXTRACT_VERSION(*(ext_dp->icmp_ext_version_res)) !=
+ ICMP_MPLS_EXT_VERSION) {
+ ND_PRINT(" packet not supported");
+ return;
+ }
+
+ hlen = plen - ICMP_EXTD_MINLEN;
+ if (ND_TTEST_LEN(ext_dp->icmp_ext_version_res, hlen)) {
+ vec[0].ptr = (const uint8_t *)(const void *)&ext_dp->icmp_ext_version_res;
+ vec[0].len = hlen;
+ ND_PRINT(", checksum 0x%04x (%scorrect), length %u",
+ GET_BE_U_2(ext_dp->icmp_ext_checksum),
+ in_cksum(vec, 1) ? "in" : "",
+ hlen);
+ }
+
+ hlen -= 4; /* subtract common header size */
+ obj_tptr = (const uint8_t *)ext_dp->icmp_ext_data;
+
+ while (hlen > sizeof(struct icmp_multipart_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_multipart_ext_obj_values,"unknown",obj_class_num),
+ obj_class_num,
+ obj_ctype,
+ obj_tlen);
+
+ 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_multipart_ext_object_header_t))) {
+ return;
+ }
+ obj_tlen-=sizeof(struct icmp_multipart_ext_object_header_t);
+
+ switch (obj_class_num) {
+ 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, 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;
+ default:
+ print_unknown_data(ndo, obj_tptr, "\n\t ", obj_tlen);
+ }
+ break;
+
+ 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;
+ }
+ if (hlen < obj_tlen)
+ break;
+ hlen -= obj_tlen;
+ obj_tptr += obj_tlen;
+ }
+ }
+
projects / tcpdump / blobdiff