/*
- * Copyright (c) 1998-2004 Hannes Gredler <hannes@tcpdump.org>
+ * Copyright (c) 1998-2004 Hannes Gredler <hannes@gredler.at>
* The TCPDUMP project
*
* Redistribution and use in source and binary forms, with or without
* FOR A PARTICULAR PURPOSE.
*/
-#define NETDISSECT_REWORKED
+/* \summary: Enhanced Interior Gateway Routing Protocol (EIGRP) printer */
+
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#include <tcpdump-stdinc.h>
+#include <netdissect-stdinc.h>
#include <string.h>
-#include "interface.h"
+#include "netdissect.h"
#include "extract.h"
#include "addrtoname.h"
/*
* packet format documented at
* http://www.rhyshaden.com/eigrp.htm
+ * RFC 7868
*/
struct eigrp_common_header {
- u_int8_t version;
- u_int8_t opcode;
- u_int8_t checksum[2];
- u_int8_t flags[4];
- u_int8_t seq[4];
- u_int8_t ack[4];
- u_int8_t asn[4];
+ uint8_t version;
+ uint8_t opcode;
+ uint8_t checksum[2];
+ uint8_t flags[4];
+ uint8_t seq[4];
+ uint8_t ack[4];
+ uint8_t asn[4];
};
#define EIGRP_VERSION 2
};
struct eigrp_tlv_header {
- u_int8_t type[2];
- u_int8_t length[2];
+ uint8_t type[2];
+ uint8_t length[2];
};
#define EIGRP_TLV_GENERAL_PARM 0x0001
};
struct eigrp_tlv_general_parm_t {
- u_int8_t k1;
- u_int8_t k2;
- u_int8_t k3;
- u_int8_t k4;
- u_int8_t k5;
- u_int8_t res;
- u_int8_t holdtime[2];
+ uint8_t k1;
+ uint8_t k2;
+ uint8_t k3;
+ uint8_t k4;
+ uint8_t k5;
+ uint8_t res;
+ uint8_t holdtime[2];
};
struct eigrp_tlv_sw_version_t {
- u_int8_t ios_major;
- u_int8_t ios_minor;
- u_int8_t eigrp_major;
- u_int8_t eigrp_minor;
+ uint8_t ios_major;
+ uint8_t ios_minor;
+ uint8_t eigrp_major;
+ uint8_t eigrp_minor;
};
struct eigrp_tlv_ip_int_t {
- u_int8_t nexthop[4];
- u_int8_t delay[4];
- u_int8_t bandwidth[4];
- u_int8_t mtu[3];
- u_int8_t hopcount;
- u_int8_t reliability;
- u_int8_t load;
- u_int8_t reserved[2];
- u_int8_t plen;
- u_int8_t destination; /* variable length [1-4] bytes encoding */
+ uint8_t nexthop[4];
+ uint8_t delay[4];
+ uint8_t bandwidth[4];
+ uint8_t mtu[3];
+ uint8_t hopcount;
+ uint8_t reliability;
+ uint8_t load;
+ uint8_t reserved[2];
+ uint8_t plen;
+ uint8_t destination; /* variable length [1-4] bytes encoding */
};
struct eigrp_tlv_ip_ext_t {
- u_int8_t nexthop[4];
- u_int8_t origin_router[4];
- u_int8_t origin_as[4];
- u_int8_t tag[4];
- u_int8_t metric[4];
- u_int8_t reserved[2];
- u_int8_t proto_id;
- u_int8_t flags;
- u_int8_t delay[4];
- u_int8_t bandwidth[4];
- u_int8_t mtu[3];
- u_int8_t hopcount;
- u_int8_t reliability;
- u_int8_t load;
- u_int8_t reserved2[2];
- u_int8_t plen;
- u_int8_t destination; /* variable length [1-4] bytes encoding */
+ uint8_t nexthop[4];
+ uint8_t origin_router[4];
+ uint8_t origin_as[4];
+ uint8_t tag[4];
+ uint8_t metric[4];
+ uint8_t reserved[2];
+ uint8_t proto_id;
+ uint8_t flags;
+ uint8_t delay[4];
+ uint8_t bandwidth[4];
+ uint8_t mtu[3];
+ uint8_t hopcount;
+ uint8_t reliability;
+ uint8_t load;
+ uint8_t reserved2[2];
+ uint8_t plen;
+ uint8_t destination; /* variable length [1-4] bytes encoding */
};
struct eigrp_tlv_at_cable_setup_t {
- u_int8_t cable_start[2];
- u_int8_t cable_end[2];
- u_int8_t router_id[4];
+ uint8_t cable_start[2];
+ uint8_t cable_end[2];
+ uint8_t router_id[4];
};
struct eigrp_tlv_at_int_t {
- u_int8_t nexthop[4];
- u_int8_t delay[4];
- u_int8_t bandwidth[4];
- u_int8_t mtu[3];
- u_int8_t hopcount;
- u_int8_t reliability;
- u_int8_t load;
- u_int8_t reserved[2];
- u_int8_t cable_start[2];
- u_int8_t cable_end[2];
+ uint8_t nexthop[4];
+ uint8_t delay[4];
+ uint8_t bandwidth[4];
+ uint8_t mtu[3];
+ uint8_t hopcount;
+ uint8_t reliability;
+ uint8_t load;
+ uint8_t reserved[2];
+ uint8_t cable_start[2];
+ uint8_t cable_end[2];
};
struct eigrp_tlv_at_ext_t {
- u_int8_t nexthop[4];
- u_int8_t origin_router[4];
- u_int8_t origin_as[4];
- u_int8_t tag[4];
- u_int8_t proto_id;
- u_int8_t flags;
- u_int8_t metric[2];
- u_int8_t delay[4];
- u_int8_t bandwidth[4];
- u_int8_t mtu[3];
- u_int8_t hopcount;
- u_int8_t reliability;
- u_int8_t load;
- u_int8_t reserved2[2];
- u_int8_t cable_start[2];
- u_int8_t cable_end[2];
+ uint8_t nexthop[4];
+ uint8_t origin_router[4];
+ uint8_t origin_as[4];
+ uint8_t tag[4];
+ uint8_t proto_id;
+ uint8_t flags;
+ uint8_t metric[2];
+ uint8_t delay[4];
+ uint8_t bandwidth[4];
+ uint8_t mtu[3];
+ uint8_t hopcount;
+ uint8_t reliability;
+ uint8_t load;
+ uint8_t reserved2[2];
+ uint8_t cable_start[2];
+ uint8_t cable_end[2];
};
static const struct tok eigrp_ext_proto_id_values[] = {
};
void
-eigrp_print(netdissect_options *ndo, register const u_char *pptr, register u_int len) {
-
+eigrp_print(netdissect_options *ndo, register const u_char *pptr, register u_int len)
+{
const struct eigrp_common_header *eigrp_com_header;
const struct eigrp_tlv_header *eigrp_tlv_header;
const u_char *tptr,*tlv_tptr;
u_int tlen,eigrp_tlv_len,eigrp_tlv_type,tlv_tlen, byte_length, bit_length;
- u_int8_t prefix[4];
+ uint8_t prefix[4];
union {
const struct eigrp_tlv_general_parm_t *eigrp_tlv_general_parm;
/* ok they seem to want to know everything - lets fully decode it */
+ if (len < sizeof(struct eigrp_common_header)) {
+ ND_PRINT((ndo, "EIGRP %s, length: %u (too short, < %u)",
+ tok2str(eigrp_opcode_values, "unknown (%u)",eigrp_com_header->opcode),
+ len, (u_int) sizeof(struct eigrp_common_header)));
+ return;
+ }
tlen=len-sizeof(struct eigrp_common_header);
/* FIXME print other header info */
eigrp_tlv_type,
eigrp_tlv_len));
+ if (eigrp_tlv_len < sizeof(struct eigrp_tlv_header)) {
+ ND_PRINT((ndo, " (too short, < %u)",
+ (u_int) sizeof(struct eigrp_tlv_header)));
+ break;
+ }
tlv_tptr=tptr+sizeof(struct eigrp_tlv_header);
tlv_tlen=eigrp_tlv_len-sizeof(struct eigrp_tlv_header);
case EIGRP_TLV_GENERAL_PARM:
tlv_ptr.eigrp_tlv_general_parm = (const struct eigrp_tlv_general_parm_t *)tlv_tptr;
+ if (tlv_tlen < sizeof(*tlv_ptr.eigrp_tlv_general_parm)) {
+ ND_PRINT((ndo, " (too short, < %u)",
+ (u_int) (sizeof(struct eigrp_tlv_header) + sizeof(*tlv_ptr.eigrp_tlv_general_parm))));
+ break;
+ }
ND_PRINT((ndo, "\n\t holdtime: %us, k1 %u, k2 %u, k3 %u, k4 %u, k5 %u",
EXTRACT_16BITS(tlv_ptr.eigrp_tlv_general_parm->holdtime),
case EIGRP_TLV_SW_VERSION:
tlv_ptr.eigrp_tlv_sw_version = (const struct eigrp_tlv_sw_version_t *)tlv_tptr;
+ if (tlv_tlen < sizeof(*tlv_ptr.eigrp_tlv_sw_version)) {
+ ND_PRINT((ndo, " (too short, < %u)",
+ (u_int) (sizeof(struct eigrp_tlv_header) + sizeof(*tlv_ptr.eigrp_tlv_sw_version))));
+ break;
+ }
ND_PRINT((ndo, "\n\t IOS version: %u.%u, EIGRP version %u.%u",
tlv_ptr.eigrp_tlv_sw_version->ios_major,
case EIGRP_TLV_IP_INT:
tlv_ptr.eigrp_tlv_ip_int = (const struct eigrp_tlv_ip_int_t *)tlv_tptr;
+ if (tlv_tlen < sizeof(*tlv_ptr.eigrp_tlv_ip_int)) {
+ ND_PRINT((ndo, " (too short, < %u)",
+ (u_int) (sizeof(struct eigrp_tlv_header) + sizeof(*tlv_ptr.eigrp_tlv_ip_int))));
+ break;
+ }
bit_length = tlv_ptr.eigrp_tlv_ip_int->plen;
if (bit_length > 32) {
}
byte_length = (bit_length + 7) / 8; /* variable length encoding */
memset(prefix, 0, 4);
+ ND_TCHECK2(tlv_ptr.eigrp_tlv_ip_int->destination, byte_length);
memcpy(prefix,&tlv_ptr.eigrp_tlv_ip_int->destination,byte_length);
ND_PRINT((ndo, "\n\t IPv4 prefix: %15s/%u, nexthop: ",
- ipaddr_string(prefix),
+ ipaddr_string(ndo, prefix),
bit_length));
if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_int->nexthop) == 0)
ND_PRINT((ndo, "self"));
else
- ND_PRINT((ndo, "%s",ipaddr_string(&tlv_ptr.eigrp_tlv_ip_int->nexthop)));
+ ND_PRINT((ndo, "%s",ipaddr_string(ndo, &tlv_ptr.eigrp_tlv_ip_int->nexthop)));
ND_PRINT((ndo, "\n\t delay %u ms, bandwidth %u Kbps, mtu %u, hop %u, reliability %u, load %u",
(EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_int->delay)/100),
case EIGRP_TLV_IP_EXT:
tlv_ptr.eigrp_tlv_ip_ext = (const struct eigrp_tlv_ip_ext_t *)tlv_tptr;
+ if (tlv_tlen < sizeof(*tlv_ptr.eigrp_tlv_ip_ext)) {
+ ND_PRINT((ndo, " (too short, < %u)",
+ (u_int) (sizeof(struct eigrp_tlv_header) + sizeof(*tlv_ptr.eigrp_tlv_ip_ext))));
+ break;
+ }
bit_length = tlv_ptr.eigrp_tlv_ip_ext->plen;
if (bit_length > 32) {
}
byte_length = (bit_length + 7) / 8; /* variable length encoding */
memset(prefix, 0, 4);
+ ND_TCHECK2(tlv_ptr.eigrp_tlv_ip_ext->destination, byte_length);
memcpy(prefix,&tlv_ptr.eigrp_tlv_ip_ext->destination,byte_length);
ND_PRINT((ndo, "\n\t IPv4 prefix: %15s/%u, nexthop: ",
- ipaddr_string(prefix),
+ ipaddr_string(ndo, prefix),
bit_length));
if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_ext->nexthop) == 0)
ND_PRINT((ndo, "self"));
else
- ND_PRINT((ndo, "%s",ipaddr_string(&tlv_ptr.eigrp_tlv_ip_ext->nexthop)));
+ ND_PRINT((ndo, "%s",ipaddr_string(ndo, &tlv_ptr.eigrp_tlv_ip_ext->nexthop)));
ND_PRINT((ndo, "\n\t origin-router %s, origin-as %u, origin-proto %s, flags [0x%02x], tag 0x%08x, metric %u",
- ipaddr_string(tlv_ptr.eigrp_tlv_ip_ext->origin_router),
+ ipaddr_string(ndo, tlv_ptr.eigrp_tlv_ip_ext->origin_router),
EXTRACT_32BITS(tlv_ptr.eigrp_tlv_ip_ext->origin_as),
tok2str(eigrp_ext_proto_id_values,"unknown",tlv_ptr.eigrp_tlv_ip_ext->proto_id),
tlv_ptr.eigrp_tlv_ip_ext->flags,
case EIGRP_TLV_AT_CABLE_SETUP:
tlv_ptr.eigrp_tlv_at_cable_setup = (const struct eigrp_tlv_at_cable_setup_t *)tlv_tptr;
+ if (tlv_tlen < sizeof(*tlv_ptr.eigrp_tlv_at_cable_setup)) {
+ ND_PRINT((ndo, " (too short, < %u)",
+ (u_int) (sizeof(struct eigrp_tlv_header) + sizeof(*tlv_ptr.eigrp_tlv_at_cable_setup))));
+ break;
+ }
ND_PRINT((ndo, "\n\t Cable-range: %u-%u, Router-ID %u",
EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_cable_setup->cable_start),
case EIGRP_TLV_AT_INT:
tlv_ptr.eigrp_tlv_at_int = (const struct eigrp_tlv_at_int_t *)tlv_tptr;
+ if (tlv_tlen < sizeof(*tlv_ptr.eigrp_tlv_at_int)) {
+ ND_PRINT((ndo, " (too short, < %u)",
+ (u_int) (sizeof(struct eigrp_tlv_header) + sizeof(*tlv_ptr.eigrp_tlv_at_int))));
+ break;
+ }
ND_PRINT((ndo, "\n\t Cable-Range: %u-%u, nexthop: ",
EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_int->cable_start),
case EIGRP_TLV_AT_EXT:
tlv_ptr.eigrp_tlv_at_ext = (const struct eigrp_tlv_at_ext_t *)tlv_tptr;
+ if (tlv_tlen < sizeof(*tlv_ptr.eigrp_tlv_at_ext)) {
+ ND_PRINT((ndo, " (too short, < %u)",
+ (u_int) (sizeof(struct eigrp_tlv_header) + sizeof(*tlv_ptr.eigrp_tlv_at_ext))));
+ break;
+ }
ND_PRINT((ndo, "\n\t Cable-Range: %u-%u, nexthop: ",
EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_ext->cable_start),
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