* POSSIBILITY OF SUCH DAMAGE.
*/
+/* \summary: - Locator/Identifier Separation Protocol (LISP) printer */
+
/*
- * tcpdump filter for LISP - Locator/Identifier Separation Protocol
- * RFC 6830
+ * specification: RFC 6830
*
*
* The Map-Register message format is:
* +-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
-
#ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
#endif
-#include <netdissect-stdinc.h>
-#include <netdissect.h>
+#include "netdissect-stdinc.h"
+#include "netdissect.h"
#include <string.h>
#include <stdlib.h>
#include "ip.h"
-#ifdef INET6
#include "ip6.h"
-#endif
#include "extract.h"
-#include "interface.h"
#include "addrtoname.h"
+
#define IPv4_AFI 1
#define IPv6_AFI 2
#define TYPE_INDEX 4
};
typedef struct map_register_hdr {
- uint8_t type_and_flag;
- uint8_t reserved;
- uint8_t reserved_and_flag2;
- uint8_t record_count;
- uint64_t nonce;
- uint16_t key_id;
- uint16_t auth_data_len;
-} UNALIGNED lisp_map_register_hdr;
+ nd_uint8_t type_and_flag;
+ nd_uint8_t reserved;
+ nd_uint8_t reserved_and_flag2;
+ nd_uint8_t record_count;
+ nd_uint64_t nonce;
+ nd_uint16_t key_id;
+ nd_uint16_t auth_data_len;
+} lisp_map_register_hdr;
#define MAP_REGISTER_HDR_LEN sizeof(lisp_map_register_hdr)
typedef struct map_register_eid {
- uint32_t ttl;
- uint8_t locator_count;
- uint8_t eid_prefix_mask_length;
- uint8_t act_auth_inc_res;
- uint8_t reserved;
- uint8_t reserved_version_hi;
- uint8_t version_low;
- uint16_t eid_prefix_afi;
-} UNALIGNED lisp_map_register_eid;
+ nd_uint32_t ttl;
+ nd_uint8_t locator_count;
+ nd_uint8_t eid_prefix_mask_length;
+ nd_uint8_t act_auth_inc_res;
+ nd_uint8_t reserved;
+ nd_uint16_t reserved_and_version;
+ nd_uint16_t eid_prefix_afi;
+} lisp_map_register_eid;
#define MAP_REGISTER_EID_LEN sizeof(lisp_map_register_eid)
typedef struct map_register_loc {
- uint8_t priority;
- uint8_t weight;
- uint8_t m_priority;
- uint8_t m_weight;
- uint16_t unused_and_flag;
- uint16_t locator_afi;
-} UNALIGNED lisp_map_register_loc;
+ nd_uint8_t priority;
+ nd_uint8_t weight;
+ nd_uint8_t m_priority;
+ nd_uint8_t m_weight;
+ nd_uint16_t unused_and_flag;
+ nd_uint16_t locator_afi;
+} lisp_map_register_loc;
#define MAP_REGISTER_LOC_LEN sizeof(lisp_map_register_loc)
-static inline uint8_t extract_lisp_type(uint8_t);
-static inline uint8_t is_xtr_data_present(uint8_t , uint8_t);
+static uint8_t extract_lisp_type(uint8_t);
+static uint8_t is_xtr_data_present(uint8_t, uint8_t);
static void lisp_hdr_flag(netdissect_options *, const lisp_map_register_hdr *);
static void action_flag(netdissect_options *, uint8_t);
static void loc_hdr_flag(netdissect_options *, uint16_t);
-void lisp_print(netdissect_options *ndo, const u_char *bp, u_int length)
+void
+lisp_print(netdissect_options *ndo, const u_char *bp, u_int length)
{
+ uint8_t type_and_flag;
uint8_t type;
uint8_t mask_len;
uint8_t loc_count;
const lisp_map_register_eid *lisp_eid;
const lisp_map_register_loc *lisp_loc;
+ ndo->ndo_protocol = "lisp";
/* Check if enough bytes for header are available */
- ND_TCHECK2(*bp, MAP_REGISTER_HDR_LEN);
+ ND_TCHECK_LEN(bp, MAP_REGISTER_HDR_LEN);
lisp_hdr = (const lisp_map_register_hdr *) bp;
lisp_hdr_flag(ndo, lisp_hdr);
/* Supporting only MAP NOTIFY and MAP REGISTER LISP packets */
- type = extract_lisp_type(lisp_hdr->type_and_flag);
+ type_and_flag = GET_U_1(lisp_hdr->type_and_flag);
+ type = extract_lisp_type(type_and_flag);
if ((type != LISP_MAP_REGISTER) && (type != LISP_MAP_NOTIFY))
return;
/* Find if the packet contains xTR and Site-ID data */
- xtr_present = is_xtr_data_present(type, lisp_hdr->type_and_flag);
+ xtr_present = is_xtr_data_present(type, type_and_flag);
/* Extract the number of EID records present */
- auth_data_len = EXTRACT_16BITS(&lisp_hdr->auth_data_len);
+ auth_data_len = GET_BE_U_2(lisp_hdr->auth_data_len);
packet_iterator = (const u_char *)(lisp_hdr);
packet_offset = MAP_REGISTER_HDR_LEN;
- record_count = lisp_hdr->record_count;
+ record_count = GET_U_1(lisp_hdr->record_count);
if (ndo->ndo_vflag) {
- key_id = EXTRACT_16BITS(&lisp_hdr->key_id);
- ND_PRINT((ndo, "\n %u record(s), ", record_count));
- ND_PRINT((ndo, "Authentication %s,",
- tok2str(auth_type, "unknown-type", key_id)));
+ key_id = GET_BE_U_2(lisp_hdr->key_id);
+ ND_PRINT("\n %u record(s), ", record_count);
+ ND_PRINT("Authentication %s,",
+ tok2str(auth_type, "unknown-type", key_id));
hex_print(ndo, "\n Authentication-Data: ", packet_iterator +
packet_offset, auth_data_len);
} else {
- ND_PRINT((ndo, " %u record(s),", record_count));
+ ND_PRINT(" %u record(s),", record_count);
}
packet_offset += auth_data_len;
if (record_count == 0)
- goto malformed;
+ goto invalid;
/* Print all the EID records */
while ((length > packet_offset) && (record_count--)) {
- ND_TCHECK2(*(packet_iterator + packet_offset), MAP_REGISTER_EID_LEN);
- ND_PRINT((ndo, "\n"));
+ ND_TCHECK_LEN(packet_iterator + packet_offset,
+ MAP_REGISTER_EID_LEN);
+ ND_PRINT("\n");
lisp_eid = (const lisp_map_register_eid *)
((const u_char *)lisp_hdr + packet_offset);
packet_offset += MAP_REGISTER_EID_LEN;
- mask_len = lisp_eid->eid_prefix_mask_length;
- eid_afi = EXTRACT_16BITS(&lisp_eid->eid_prefix_afi);
- loc_count = lisp_eid->locator_count;
+ mask_len = GET_U_1(lisp_eid->eid_prefix_mask_length);
+ eid_afi = GET_BE_U_2(lisp_eid->eid_prefix_afi);
+ loc_count = GET_U_1(lisp_eid->locator_count);
if (ndo->ndo_vflag) {
- ttl = EXTRACT_32BITS(&lisp_eid->ttl);
- ND_PRINT((ndo, " Record TTL %u,", ttl));
- action_flag(ndo, lisp_eid->act_auth_inc_res);
- map_version = (((lisp_eid->reserved_version_hi) & 15 ) * 255) +
- lisp_eid->version_low;
- ND_PRINT((ndo, " Map Version: %u,", map_version));
+ ttl = GET_BE_U_4(lisp_eid->ttl);
+ ND_PRINT(" Record TTL %u,", ttl);
+ action_flag(ndo, GET_U_1(lisp_eid->act_auth_inc_res));
+ map_version = GET_BE_U_2(lisp_eid->reserved_and_version) & 0x0FFF;
+ ND_PRINT(" Map Version: %u,", map_version);
}
switch (eid_afi) {
case IPv4_AFI:
- ND_TCHECK2(*(packet_iterator + packet_offset), 4);
- ND_PRINT((ndo, " EID %s/%u,", getname(ndo,
- packet_iterator + packet_offset), mask_len));
+ ND_PRINT(" EID %s/%u,",
+ GET_IPADDR_STRING(packet_iterator + packet_offset),
+ mask_len);
packet_offset += 4;
break;
case IPv6_AFI:
- ND_TCHECK2(*(packet_iterator + packet_offset), 16);
- #ifdef INET6
- ND_PRINT((ndo, " EID %s/%u,", getname6(ndo,
- packet_iterator + packet_offset), mask_len));
- #else
- ND_PRINT((ndo, " IPv6 EID,"));
- #endif
+ ND_PRINT(" EID %s/%u,",
+ GET_IP6ADDR_STRING(packet_iterator + packet_offset),
+ mask_len);
packet_offset += 16;
break;
default:
break;
}
- ND_PRINT((ndo, " %u locator(s)", loc_count));
+ ND_PRINT(" %u locator(s)", loc_count);
while (loc_count--) {
- ND_TCHECK2(*(packet_iterator + packet_offset), MAP_REGISTER_LOC_LEN);
+ ND_TCHECK_LEN(packet_iterator + packet_offset,
+ MAP_REGISTER_LOC_LEN);
lisp_loc = (const lisp_map_register_loc *) (packet_iterator + packet_offset);
loc_ip_pointer = (const u_char *) (lisp_loc + 1);
packet_offset += MAP_REGISTER_LOC_LEN;
- loc_afi = EXTRACT_16BITS(&lisp_loc->locator_afi);
+ loc_afi = GET_BE_U_2(lisp_loc->locator_afi);
if (ndo->ndo_vflag)
- ND_PRINT((ndo, "\n "));
+ ND_PRINT("\n ");
switch (loc_afi) {
case IPv4_AFI:
- ND_TCHECK2(*(packet_iterator + packet_offset), 4);
- ND_PRINT((ndo, " LOC %s", getname(ndo, loc_ip_pointer)));
+ ND_TCHECK_4(packet_iterator + packet_offset);
+ ND_PRINT(" LOC %s", GET_IPADDR_STRING(loc_ip_pointer));
packet_offset += 4;
break;
case IPv6_AFI:
- ND_TCHECK2(*(packet_iterator + packet_offset), 16);
- #ifdef INET6
- ND_PRINT((ndo, " LOC %s", getname6(ndo, loc_ip_pointer)));
- #else
- ND_PRINT((ndo, " LOC IPv6"));
- #endif
+ ND_TCHECK_16(packet_iterator + packet_offset);
+ ND_PRINT(" LOC %s", GET_IP6ADDR_STRING(loc_ip_pointer));
packet_offset += 16;
break;
default:
break;
}
if (ndo->ndo_vflag) {
- ND_PRINT((ndo, "\n Priority/Weight %u/%u,"
+ ND_PRINT("\n Priority/Weight %u/%u,"
" Multicast Priority/Weight %u/%u,",
- lisp_loc->priority, lisp_loc->weight,
- lisp_loc->m_priority, lisp_loc->m_weight));
- loc_hdr_flag(ndo, EXTRACT_16BITS(&lisp_loc->unused_and_flag));
+ GET_U_1(lisp_loc->priority),
+ GET_U_1(lisp_loc->weight),
+ GET_U_1(lisp_loc->m_priority),
+ GET_U_1(lisp_loc->m_weight));
+ loc_hdr_flag(ndo,
+ GET_BE_U_2(lisp_loc->unused_and_flag));
}
}
}
/*
- * Print xTR and Site ID. Handle the fact that the packet could be malformed.
+ * Print xTR and Site ID. Handle the fact that the packet could be invalid.
* If the xTR_ID_Present bit is not set, and we still have data to display,
* show it as hex data.
*/
if (xtr_present) {
- if (!ND_TTEST2(*(packet_iterator + packet_offset), 24))
- goto malformed;
- hex_print_with_offset(ndo, "\n xTR-ID: ", packet_iterator + packet_offset, 16, 0);
- ND_PRINT((ndo, "\n SITE-ID: %" PRIu64,
- EXTRACT_64BITS(packet_iterator + packet_offset + 16)));
+ if (!ND_TTEST_LEN(packet_iterator + packet_offset, 24))
+ goto invalid;
+ hex_print(ndo, "\n xTR-ID: ", packet_iterator + packet_offset, 16);
+ ND_PRINT("\n SITE-ID: %" PRIu64,
+ GET_BE_U_8(packet_iterator + packet_offset + 16));
} else {
/* Check if packet isn't over yet */
if (packet_iterator + packet_offset < ndo->ndo_snapend) {
- hex_print_with_offset(ndo, "\n Data: ", packet_iterator + packet_offset,
- (ndo->ndo_snapend - (packet_iterator + packet_offset)), 0);
+ hex_print(ndo, "\n Data: ", packet_iterator + packet_offset,
+ ND_BYTES_AVAILABLE_AFTER(packet_iterator + packet_offset));
}
}
return;
trunc:
- ND_PRINT((ndo, "\n [|LISP]"));
- return;
-malformed:
- ND_PRINT((ndo, "\n (malformed-packet)"));
+ nd_print_trunc(ndo);
return;
+invalid:
+ nd_print_invalid(ndo);
}
-
-static inline uint8_t extract_lisp_type(uint8_t lisp_hdr_flags)
+static uint8_t
+extract_lisp_type(uint8_t lisp_hdr_flags)
{
return (lisp_hdr_flags) >> TYPE_INDEX;
}
-static inline uint8_t is_xtr_data_present(uint8_t type, uint8_t lisp_hdr_flags)
+static uint8_t
+is_xtr_data_present(uint8_t type, uint8_t lisp_hdr_flags)
{
- uint8_t xtr_present;
+ uint8_t xtr_present = 0;
if (type == LISP_MAP_REGISTER)
xtr_present = (lisp_hdr_flags) & LISP_MAP_REGISTER_IBIT_MASK;
static void lisp_hdr_flag(netdissect_options *ndo, const lisp_map_register_hdr *lisp_hdr)
{
- uint8_t type = extract_lisp_type(lisp_hdr->type_and_flag);
+ uint8_t type = extract_lisp_type(GET_U_1(lisp_hdr->type_and_flag));
if (!ndo->ndo_vflag) {
- ND_PRINT((ndo, "%s,", tok2str(lisp_type, "unknown-type-%u", type)));
+ ND_PRINT("%s,", tok2str(lisp_type, "unknown-type-%u", type));
return;
} else {
- ND_PRINT((ndo, "%s,", tok2str(lisp_type, "unknown-type-%u", type)));
+ ND_PRINT("%s,", tok2str(lisp_type, "unknown-type-%u", type));
}
if (type == LISP_MAP_REGISTER) {
- ND_PRINT((ndo, " flags [%s],", bittok2str(map_register_hdr_flag,
- "none", EXTRACT_32BITS(lisp_hdr))));
+ ND_PRINT(" flags [%s],", bittok2str(map_register_hdr_flag,
+ "none", GET_BE_U_4(lisp_hdr)));
} else if (type == LISP_MAP_NOTIFY) {
- ND_PRINT((ndo, " flags [%s],", bittok2str(map_notify_hdr_flag,
- "none", EXTRACT_32BITS(lisp_hdr))));
+ ND_PRINT(" flags [%s],", bittok2str(map_notify_hdr_flag,
+ "none", GET_BE_U_4(lisp_hdr)));
}
-
- return;
}
-
static void action_flag(netdissect_options *ndo, uint8_t act_auth_inc_res)
{
uint8_t action;
authoritative = ((act_auth_inc_res >> 4) & 1);
if (authoritative)
- ND_PRINT((ndo, " Authoritative,"));
+ ND_PRINT(" Authoritative,");
else
- ND_PRINT((ndo, " Non-Authoritative,"));
+ ND_PRINT(" Non-Authoritative,");
action = act_auth_inc_res >> 5;
- ND_PRINT((ndo, " %s,", tok2str(lisp_eid_action, "unknown", action)));
+ ND_PRINT(" %s,", tok2str(lisp_eid_action, "unknown", action));
}
-
static void loc_hdr_flag(netdissect_options *ndo, uint16_t flag)
{
- ND_PRINT((ndo, " flags [%s],", bittok2str(lisp_loc_flag, "none", flag)));
+ ND_PRINT(" flags [%s],", bittok2str(lisp_loc_flag, "none", flag));
}
projects / tcpdump / blobdiff