#ifndef lint
static const char rcsid[] _U_ =
- "@(#) $Header: /tcpdump/master/tcpdump/print-ldp.c,v 1.13 2005-05-03 08:21:09 hannes Exp $";
+ "@(#) $Header: /tcpdump/master/tcpdump/print-ldp.c,v 1.20 2006-06-23 02:03:09 hannes Exp $";
#endif
#ifdef HAVE_CONFIG_H
#include "addrtoname.h"
#include "l2vpn.h"
+#include "af.h"
/*
* ldp common header
{ LDP_MSG_INIT, "Initialization" },
{ LDP_MSG_KEEPALIVE, "Keepalive" },
{ LDP_MSG_ADDRESS, "Address" },
- { LDP_MSG_ADDRESS_WITHDRAW, "Address Widthdraw" },
+ { LDP_MSG_ADDRESS_WITHDRAW, "Address Withdraw" },
{ LDP_MSG_LABEL_MAPPING, "Label Mapping" },
{ LDP_MSG_LABEL_REQUEST, "Label Request" },
{ LDP_MSG_LABEL_WITHDRAW, "Label Withdraw" },
#define LDP_TLV_FEC 0x0100
#define LDP_TLV_ADDRESS_LIST 0x0101
+#define LDP_TLV_ADDRESS_LIST_AFNUM_LEN 2
#define LDP_TLV_HOP_COUNT 0x0103
#define LDP_TLV_PATH_VECTOR 0x0104
#define LDP_TLV_GENERIC_LABEL 0x0200
#define LDP_TLV_FR_SESSION_PARM 0x0502
#define LDP_TLV_FT_SESSION 0x0503
#define LDP_TLV_LABEL_REQUEST_MSG_ID 0x0600
+#define LDP_TLV_MTU 0x0601 /* rfc 3988 */
static const struct tok ldp_tlv_values[] = {
{ LDP_TLV_FEC, "FEC" },
{ LDP_TLV_FR_SESSION_PARM, "Frame-Relay Session Parameters" },
{ LDP_TLV_FT_SESSION, "Fault-Tolerant Session Parameters" },
{ LDP_TLV_LABEL_REQUEST_MSG_ID, "Label Request Message ID" },
+ { LDP_TLV_MTU, "MTU" },
{ 0, NULL}
};
#define LDP_FEC_WILDCARD 0x01
#define LDP_FEC_PREFIX 0x02
#define LDP_FEC_HOSTADDRESS 0x03
-/* From draft-martini-l2circuit-trans-mpls-13.txt */
+/* From RFC 4906; should probably be updated to RFC 4447 (e.g., VC -> PW) */
#define LDP_FEC_MARTINI_VC 0x80
static const struct tok ldp_fec_values[] = {
{ 0, NULL}
};
-/* RFC1700 address family numbers, same definition in print-bgp.c */
-#define AFNUM_INET 1
-#define AFNUM_INET6 2
-
-#define FALSE 0
-#define TRUE 1
-
int ldp_msg_print(register const u_char *);
int ldp_tlv_print(register const u_char *);
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
+#define TLV_TCHECK(minlen) \
+ TCHECK2(*tptr, minlen); if (tlv_tlen < minlen) goto badtlv;
+
int
ldp_tlv_print(register const u_char *tptr) {
switch(tlv_type) {
case LDP_TLV_COMMON_HELLO:
+ TLV_TCHECK(4);
printf("\n\t Hold Time: %us, Flags: [%s Hello%s]",
EXTRACT_16BITS(tptr),
(EXTRACT_16BITS(tptr+2)&0x8000) ? "Targeted" : "Link",
break;
case LDP_TLV_IPV4_TRANSPORT_ADDR:
+ TLV_TCHECK(4);
printf("\n\t IPv4 Transport Address: %s", ipaddr_string(tptr));
break;
#ifdef INET6
case LDP_TLV_IPV6_TRANSPORT_ADDR:
+ TLV_TCHECK(16);
printf("\n\t IPv6 Transport Address: %s", ip6addr_string(tptr));
break;
#endif
case LDP_TLV_CONFIG_SEQ_NUMBER:
+ TLV_TCHECK(4);
printf("\n\t Sequence Number: %u", EXTRACT_32BITS(tptr));
break;
case LDP_TLV_ADDRESS_LIST:
+ TLV_TCHECK(LDP_TLV_ADDRESS_LIST_AFNUM_LEN);
af = EXTRACT_16BITS(tptr);
- tptr+=2;
- printf("\n\t Adress Family: ");
- if (af == AFNUM_INET) {
- printf("IPv4, addresses:");
- for (i=0; i<(tlv_tlen-2)/4; i++) {
+ tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
+ tlv_tlen -= LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
+ printf("\n\t Address Family: %s, addresses",
+ tok2str(af_values, "Unknown (%u)", af));
+ switch (af) {
+ case AFNUM_INET:
+ while(tlv_tlen >= sizeof(struct in_addr)) {
+ TCHECK2(*tptr, sizeof(struct in_addr));
printf(" %s",ipaddr_string(tptr));
- tptr+=4;
+ tlv_tlen-=sizeof(struct in_addr);
+ tptr+=sizeof(struct in_addr);
}
- }
+ break;
#ifdef INET6
- else if (af == AFNUM_INET6) {
- printf("IPv6, addresses:");
- for (i=0; i<(tlv_tlen-2)/16; i++) {
+ case AFNUM_INET6:
+ while(tlv_tlen >= sizeof(struct in6_addr)) {
+ TCHECK2(*tptr, sizeof(struct in6_addr));
printf(" %s",ip6addr_string(tptr));
- tptr+=16;
+ tlv_tlen-=sizeof(struct in6_addr);
+ tptr+=sizeof(struct in6_addr);
}
- }
+ break;
#endif
+ default:
+ /* unknown AF */
+ break;
+ }
break;
case LDP_TLV_COMMON_SESSION:
+ TLV_TCHECK(8);
printf("\n\t Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]",
EXTRACT_16BITS(tptr), EXTRACT_16BITS(tptr+2),
(EXTRACT_16BITS(tptr+6)&0x8000) ? "On Demand" : "Unsolicited",
break;
case LDP_TLV_FEC:
+ TLV_TCHECK(1);
fec_type = *tptr;
printf("\n\t %s FEC (0x%02x)",
tok2str(ldp_fec_values, "Unknown", fec_type),
fec_type);
tptr+=1;
+ tlv_tlen-=1;
switch(fec_type) {
case LDP_FEC_WILDCARD:
break;
case LDP_FEC_PREFIX:
+ TLV_TCHECK(2);
af = EXTRACT_16BITS(tptr);
- tptr+=2;
+ tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
+ tlv_tlen-=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
if (af == AFNUM_INET) {
- i=decode_prefix4(tptr,buf,sizeof(buf));
- printf(": IPv4 prefix %s",buf);
+ i=decode_prefix4(tptr,tlv_tlen,buf,sizeof(buf));
+ if (i == -2)
+ goto trunc;
+ if (i == -3)
+ printf(": IPv4 prefix (goes past end of TLV)");
+ else if (i == -1)
+ printf(": IPv4 prefix (invalid length)");
+ else
+ printf(": IPv4 prefix %s",buf);
}
#ifdef INET6
else if (af == AFNUM_INET6) {
- i=decode_prefix6(tptr,buf,sizeof(buf));
- printf(": IPv6 prefix %s",buf);
+ i=decode_prefix6(tptr,tlv_tlen,buf,sizeof(buf));
+ if (i == -2)
+ goto trunc;
+ if (i == -3)
+ printf(": IPv4 prefix (goes past end of TLV)");
+ else if (i == -1)
+ printf(": IPv6 prefix (invalid length)");
+ else
+ printf(": IPv6 prefix %s",buf);
}
#endif
+ else
+ printf(": Address family %u prefix", af);
break;
case LDP_FEC_HOSTADDRESS:
break;
case LDP_FEC_MARTINI_VC:
- if (!TTEST2(*tptr, 11))
- goto trunc;
+ /*
+ * According to RFC 4908, the VC info Length field can be zero,
+ * in which case not only are there no interface parameters,
+ * there's no VC ID.
+ */
+ TLV_TCHECK(7);
vc_info_len = *(tptr+2);
+ if (vc_info_len == 0) {
+ printf(": %s, %scontrol word, group-ID %u, VC-info-length: %u",
+ tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
+ EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
+ EXTRACT_32BITS(tptr+3),
+ vc_info_len);
+ break;
+ }
+
+ /* Make sure we have the VC ID as well */
+ TLV_TCHECK(11);
printf(": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u",
tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
EXTRACT_32BITS(tptr+3),
EXTRACT_32BITS(tptr+7),
vc_info_len);
+ if (vc_info_len < 4)
+ goto trunc; /* minimum 4, for the VC ID */
+ vc_info_len -= 4; /* subtract out the VC ID, giving the length of the interface parameters */
- if (vc_info_len == 0) /* infinite loop protection */
- break;
-
+ /* Skip past the fixed information and the VC ID */
tptr+=11;
- if (!TTEST2(*tptr, vc_info_len))
- goto trunc;
+ tlv_tlen-=11;
+ TLV_TCHECK(vc_info_len);
while (vc_info_len > 2) {
vc_info_tlv_type = *tptr;
vc_info_tlv_len = *(tptr+1);
if (vc_info_tlv_len < 2)
break;
+ if (vc_info_len < vc_info_tlv_len)
+ break;
printf("\n\t\tInterface Parameter: %s (0x%02x), len %u",
tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type),
break;
case LDP_TLV_GENERIC_LABEL:
+ TLV_TCHECK(4);
printf("\n\t Label: %u", EXTRACT_32BITS(tptr) & 0xfffff);
break;
case LDP_TLV_STATUS:
+ TLV_TCHECK(8);
ui = EXTRACT_32BITS(tptr);
tptr+=4;
printf("\n\t Status: 0x%02x, Flags: [%s and %s forward]",
break;
case LDP_TLV_FT_SESSION:
+ TLV_TCHECK(8);
ft_flags = EXTRACT_16BITS(tptr);
printf("\n\t Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]",
ft_flags&0x8000 ? "" : "No ",
printf(", Recovery Time: %ums", ui);
break;
+ case LDP_TLV_MTU:
+ TLV_TCHECK(2);
+ printf("\n\t MTU: %u", EXTRACT_16BITS(tptr));
+ break;
+
/*
* FIXME those are the defined TLVs that lack a decoder
trunc:
printf("\n\t\t packet exceeded snapshot");
return 0;
+
+badtlv:
+ printf("\n\t\t TLV contents go past end of TLV");
+ return(tlv_len+4); /* Type & Length fields not included */
}
void
while(tlen>0) {
/* did we capture enough for fully decoding the msg header ? */
- if (!TTEST2(*tptr, sizeof(struct ldp_msg_header)))
- goto trunc;
+ TCHECK2(*tptr, sizeof(struct ldp_msg_header));
ldp_msg_header = (const struct ldp_msg_header *)tptr;
msg_len=EXTRACT_16BITS(ldp_msg_header->length);
msg_tlen=msg_len-sizeof(struct ldp_msg_header)+4; /* Type & Length fields not included */
/* did we capture enough for fully decoding the message ? */
- if (!TTEST2(*tptr, msg_len))
- goto trunc;
+ TCHECK2(*tptr, msg_len);
hexdump=FALSE;
switch(msg_type) {
case LDP_MSG_KEEPALIVE:
case LDP_MSG_ADDRESS:
case LDP_MSG_LABEL_MAPPING:
+ case LDP_MSG_ADDRESS_WITHDRAW:
+ case LDP_MSG_LABEL_WITHDRAW:
while(msg_tlen >= 4) {
processed = ldp_tlv_print(msg_tptr);
if (processed == 0)
* you are welcome to contribute code ;-)
*/
- case LDP_MSG_ADDRESS_WITHDRAW:
case LDP_MSG_LABEL_REQUEST:
- case LDP_MSG_LABEL_WITHDRAW:
case LDP_MSG_LABEL_RELEASE:
case LDP_MSG_LABEL_ABORT_REQUEST:
}
/* do we want to see an additionally hexdump ? */
if (vflag > 1 || hexdump==TRUE)
- print_unknown_data(tptr+sizeof(sizeof(struct ldp_msg_header)),"\n\t ",
+ print_unknown_data(tptr+sizeof(struct ldp_msg_header),"\n\t ",
msg_len);
tptr += msg_len+4;
projects / tcpdump / blobdiff