X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/8df276dff34a0db4f43ed222ff4a90aad02d05c0..282508f16b8fde1bb95fabef1afb2d77c24a306b:/print-ldp.c diff --git a/print-ldp.c b/print-ldp.c index 25ea9581..1ee453b2 100644 --- a/print-ldp.c +++ b/print-ldp.c @@ -10,28 +10,23 @@ * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE. * - * Original code by Hannes Gredler (hannes@juniper.net) + * Original code by Hannes Gredler (hannes@gredler.at) + * and Steinar Haug (sthaug@nethelp.no) */ -#ifndef lint -static const char rcsid[] = - "@(#) $Header: /tcpdump/master/tcpdump/print-ldp.c,v 1.1 2002-12-13 00:40:35 hannes Exp $"; -#endif +/* \summary: Label Distribution Protocol (LDP) printer */ -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif +#include -#include +#include "netdissect-stdinc.h" -#include -#include -#include - -#include "interface.h" +#include "netdissect.h" #include "extract.h" #include "addrtoname.h" -#include "ethertype.h" + +#include "l2vpn.h" +#include "af.h" + /* * ldp common header @@ -49,15 +44,174 @@ static const char rcsid[] = */ struct ldp_common_header { - u_int8_t version[2]; - u_int8_t pdu_length[2]; - u_int8_t lsr_id[4]; - u_int8_t label_space[2]; + nd_uint16_t version; + nd_uint16_t pdu_length; + nd_ipv4 lsr_id; + nd_uint16_t label_space; }; #define LDP_VERSION 1 -/* +/* + * ldp message header + * + * 0 1 2 3 + * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * |U| Message Type | Message Length | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Message ID | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | | + * + + + * | Mandatory Parameters | + * + + + * | | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | | + * + + + * | Optional Parameters | + * + + + * | | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + */ + +struct ldp_msg_header { + nd_uint16_t type; + nd_uint16_t length; + nd_uint32_t id; +}; + +#define LDP_MASK_MSG_TYPE(x) ((x)&0x7fff) +#define LDP_MASK_U_BIT(x) ((x)&0x8000) + +#define LDP_MSG_NOTIF 0x0001 +#define LDP_MSG_HELLO 0x0100 +#define LDP_MSG_INIT 0x0200 +#define LDP_MSG_KEEPALIVE 0x0201 +#define LDP_MSG_ADDRESS 0x0300 +#define LDP_MSG_ADDRESS_WITHDRAW 0x0301 +#define LDP_MSG_LABEL_MAPPING 0x0400 +#define LDP_MSG_LABEL_REQUEST 0x0401 +#define LDP_MSG_LABEL_WITHDRAW 0x0402 +#define LDP_MSG_LABEL_RELEASE 0x0403 +#define LDP_MSG_LABEL_ABORT_REQUEST 0x0404 + +#define LDP_VENDOR_PRIVATE_MIN 0x3e00 +#define LDP_VENDOR_PRIVATE_MAX 0x3eff +#define LDP_EXPERIMENTAL_MIN 0x3f00 +#define LDP_EXPERIMENTAL_MAX 0x3fff + +static const struct tok ldp_msg_values[] = { + { LDP_MSG_NOTIF, "Notification" }, + { LDP_MSG_HELLO, "Hello" }, + { LDP_MSG_INIT, "Initialization" }, + { LDP_MSG_KEEPALIVE, "Keepalive" }, + { LDP_MSG_ADDRESS, "Address" }, + { LDP_MSG_ADDRESS_WITHDRAW, "Address Withdraw" }, + { LDP_MSG_LABEL_MAPPING, "Label Mapping" }, + { LDP_MSG_LABEL_REQUEST, "Label Request" }, + { LDP_MSG_LABEL_WITHDRAW, "Label Withdraw" }, + { LDP_MSG_LABEL_RELEASE, "Label Release" }, + { LDP_MSG_LABEL_ABORT_REQUEST, "Label Abort Request" }, + { 0, NULL} +}; + +#define LDP_MASK_TLV_TYPE(x) ((x)&0x3fff) +#define LDP_MASK_F_BIT(x) ((x)&0x4000) + +#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_ATM_LABEL 0x0201 +#define LDP_TLV_FR_LABEL 0x0202 +#define LDP_TLV_STATUS 0x0300 +#define LDP_TLV_EXTD_STATUS 0x0301 +#define LDP_TLV_RETURNED_PDU 0x0302 +#define LDP_TLV_RETURNED_MSG 0x0303 +#define LDP_TLV_COMMON_HELLO 0x0400 +#define LDP_TLV_IPV4_TRANSPORT_ADDR 0x0401 +#define LDP_TLV_CONFIG_SEQ_NUMBER 0x0402 +#define LDP_TLV_IPV6_TRANSPORT_ADDR 0x0403 +#define LDP_TLV_COMMON_SESSION 0x0500 +#define LDP_TLV_ATM_SESSION_PARM 0x0501 +#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_ADDRESS_LIST, "Address List" }, + { LDP_TLV_HOP_COUNT, "Hop Count" }, + { LDP_TLV_PATH_VECTOR, "Path Vector" }, + { LDP_TLV_GENERIC_LABEL, "Generic Label" }, + { LDP_TLV_ATM_LABEL, "ATM Label" }, + { LDP_TLV_FR_LABEL, "Frame-Relay Label" }, + { LDP_TLV_STATUS, "Status" }, + { LDP_TLV_EXTD_STATUS, "Extended Status" }, + { LDP_TLV_RETURNED_PDU, "Returned PDU" }, + { LDP_TLV_RETURNED_MSG, "Returned Message" }, + { LDP_TLV_COMMON_HELLO, "Common Hello Parameters" }, + { LDP_TLV_IPV4_TRANSPORT_ADDR, "IPv4 Transport Address" }, + { LDP_TLV_CONFIG_SEQ_NUMBER, "Configuration Sequence Number" }, + { LDP_TLV_IPV6_TRANSPORT_ADDR, "IPv6 Transport Address" }, + { LDP_TLV_COMMON_SESSION, "Common Session Parameters" }, + { LDP_TLV_ATM_SESSION_PARM, "ATM Session Parameters" }, + { 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 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[] = { + { LDP_FEC_WILDCARD, "Wildcard" }, + { LDP_FEC_PREFIX, "Prefix" }, + { LDP_FEC_HOSTADDRESS, "Host address" }, + { LDP_FEC_MARTINI_VC, "Martini VC" }, + { 0, NULL} +}; + +#define LDP_FEC_MARTINI_IFPARM_MTU 0x01 +#define LDP_FEC_MARTINI_IFPARM_DESC 0x03 +#define LDP_FEC_MARTINI_IFPARM_VCCV 0x0c + +static const struct tok ldp_fec_martini_ifparm_values[] = { + { LDP_FEC_MARTINI_IFPARM_MTU, "MTU" }, + { LDP_FEC_MARTINI_IFPARM_DESC, "Description" }, + { LDP_FEC_MARTINI_IFPARM_VCCV, "VCCV" }, + { 0, NULL} +}; + +/* draft-ietf-pwe3-vccv-04.txt */ +static const struct tok ldp_fec_martini_ifparm_vccv_cc_values[] = { + { 0x01, "PWE3 control word" }, + { 0x02, "MPLS Router Alert Label" }, + { 0x04, "MPLS inner label TTL = 1" }, + { 0, NULL} +}; + +/* draft-ietf-pwe3-vccv-04.txt */ +static const struct tok ldp_fec_martini_ifparm_vccv_cv_values[] = { + { 0x01, "ICMP Ping" }, + { 0x02, "LSP Ping" }, + { 0x04, "BFD" }, + { 0, NULL} +}; + +static u_int ldp_pdu_print(netdissect_options *, const u_char *); + +/* * ldp tlv header * * 0 1 2 3 @@ -74,134 +228,475 @@ struct ldp_common_header { * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ -struct ldp_tlv_header { - u_int8_t type[2]; - u_int8_t length[2]; -}; +#define TLV_TCHECK(minlen) \ + if (tlv_tlen < minlen) { \ + ND_PRINT(" [tlv length %u < %u]", tlv_tlen, minlen); \ + nd_print_invalid(ndo); \ + goto invalid; \ + } -#define LDP_MASK_TLV_TYPE(x) ((x)&0x3fff) -#define LDP_MASK_TLV_U_BIT(x) ((x)&0x8000) -#define LDP_MASK_TLV_F_BIT(x) ((x)&0x4000) +static u_int +ldp_tlv_print(netdissect_options *ndo, + const u_char *tptr, + u_int msg_tlen) +{ + struct ldp_tlv_header { + nd_uint16_t type; + nd_uint16_t length; + }; -#define LDP_TLV_FEC 0x0100 -#define LDP_TLV_ADDRESS_LIST 0x0101 -#define LDP_TLV_HOP_COUNT 0x0103 -#define LDP_TLV_PATH_VECTOR 0x0104 -#define LDP_TLV_GENERIC_LABEL 0x0200 -#define LDP_TLV_ATM_LABEL 0x0201 -#define LDP_TLV_FR_LABEL 0x0202 -#define LDP_TLV_STATUS 0x0300 + const struct ldp_tlv_header *ldp_tlv_header; + u_short tlv_type,tlv_len,tlv_tlen,af,ft_flags; + u_char fec_type; + u_int ui,vc_info_len, vc_info_tlv_type, vc_info_tlv_len,idx; + char buf[100]; + int i; -static const struct tok ldp_tlv_values[] = { - { LDP_TLV_FEC, "FEC" }, - { LDP_TLV_ADDRESS_LIST, "Address List" }, - { LDP_TLV_HOP_COUNT, "Hop Count" }, - { LDP_TLV_HOP_COUNT, "Path Vector" }, - { LDP_TLV_GENERIC_LABEL, "Generic Label" }, - { LDP_TLV_ATM_LABEL, "ATM Label" }, - { LDP_TLV_FR_LABEL, "Frame-Relay Label" }, - { LDP_TLV_STATUS, "Status" }, - { 0, NULL} -}; + ldp_tlv_header = (const struct ldp_tlv_header *)tptr; + ND_TCHECK_SIZE(ldp_tlv_header); + tlv_len=GET_BE_U_2(ldp_tlv_header->length); + if (tlv_len + 4U > msg_tlen) { + ND_PRINT("\n\t\t TLV contents go past end of message"); + return 0; + } + tlv_tlen=tlv_len; + tlv_type=LDP_MASK_TLV_TYPE(GET_BE_U_2(ldp_tlv_header->type)); + + /* FIXME vendor private / experimental check */ + ND_PRINT("\n\t %s TLV (0x%04x), length: %u, Flags: [%s and %s forward if unknown]", + tok2str(ldp_tlv_values, + "Unknown", + tlv_type), + tlv_type, + tlv_len, + LDP_MASK_U_BIT(GET_BE_U_2(ldp_tlv_header->type)) ? "continue processing" : "ignore", + LDP_MASK_F_BIT(GET_BE_U_2(ldp_tlv_header->type)) ? "do" : "don't"); + + tptr+=sizeof(struct ldp_tlv_header); -#define FALSE 0 -#define TRUE 1 + switch(tlv_type) { + + case LDP_TLV_COMMON_HELLO: + TLV_TCHECK(4); + ND_PRINT("\n\t Hold Time: %us, Flags: [%s Hello%s]", + GET_BE_U_2(tptr), + (GET_BE_U_2(tptr + 2)&0x8000) ? "Targeted" : "Link", + (GET_BE_U_2(tptr + 2)&0x4000) ? ", Request for targeted Hellos" : ""); + break; + + case LDP_TLV_IPV4_TRANSPORT_ADDR: + TLV_TCHECK(4); + ND_PRINT("\n\t IPv4 Transport Address: %s", GET_IPADDR_STRING(tptr)); + break; + case LDP_TLV_IPV6_TRANSPORT_ADDR: + TLV_TCHECK(16); + ND_PRINT("\n\t IPv6 Transport Address: %s", GET_IP6ADDR_STRING(tptr)); + break; + case LDP_TLV_CONFIG_SEQ_NUMBER: + TLV_TCHECK(4); + ND_PRINT("\n\t Sequence Number: %u", GET_BE_U_4(tptr)); + break; + + case LDP_TLV_ADDRESS_LIST: + TLV_TCHECK(LDP_TLV_ADDRESS_LIST_AFNUM_LEN); + af = GET_BE_U_2(tptr); + tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN; + tlv_tlen -= LDP_TLV_ADDRESS_LIST_AFNUM_LEN; + ND_PRINT("\n\t Address Family: %s, addresses", + tok2str(af_values, "Unknown (%u)", af)); + switch (af) { + case AFNUM_INET: + while(tlv_tlen >= sizeof(nd_ipv4)) { + ND_PRINT(" %s", GET_IPADDR_STRING(tptr)); + tlv_tlen-=sizeof(nd_ipv4); + tptr+=sizeof(nd_ipv4); + } + break; + case AFNUM_INET6: + while(tlv_tlen >= sizeof(nd_ipv6)) { + ND_PRINT(" %s", GET_IP6ADDR_STRING(tptr)); + tlv_tlen-=sizeof(nd_ipv6); + tptr+=sizeof(nd_ipv6); + } + break; + default: + /* unknown AF */ + break; + } + break; + + case LDP_TLV_COMMON_SESSION: + TLV_TCHECK(14); + ND_PRINT("\n\t Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]", + GET_BE_U_2(tptr), GET_BE_U_2(tptr + 2), + (GET_BE_U_2(tptr + 4)&0x8000) ? "On Demand" : "Unsolicited", + (GET_BE_U_2(tptr + 4)&0x4000) ? "Enabled" : "Disabled" + ); + ND_PRINT("\n\t Path Vector Limit %u, Max-PDU length: %u, Receiver Label-Space-ID %s:%u", + GET_U_1(tptr+5), + GET_BE_U_2(tptr+6), + GET_IPADDR_STRING(tptr+8), + GET_BE_U_2(tptr+12) + ); + break; + + case LDP_TLV_FEC: + TLV_TCHECK(1); + fec_type = GET_U_1(tptr); + ND_PRINT("\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 = GET_BE_U_2(tptr); + tptr+=2; + tlv_tlen-=2; + if (af == AFNUM_INET) { + i=decode_prefix4(ndo, tptr, tlv_tlen, buf, sizeof(buf)); + if (i == -2) + goto trunc; + if (i == -3) + ND_PRINT(": IPv4 prefix (goes past end of TLV)"); + else if (i == -1) + ND_PRINT(": IPv4 prefix (invalid length)"); + else + ND_PRINT(": IPv4 prefix %s", buf); + } else if (af == AFNUM_INET6) { + i=decode_prefix6(ndo, tptr, tlv_tlen, buf, sizeof(buf)); + if (i == -2) + goto trunc; + if (i == -3) + ND_PRINT(": IPv4 prefix (goes past end of TLV)"); + else if (i == -1) + ND_PRINT(": IPv6 prefix (invalid length)"); + else + ND_PRINT(": IPv6 prefix %s", buf); + } else + ND_PRINT(": Address family %u prefix", af); + break; + case LDP_FEC_HOSTADDRESS: + break; + case LDP_FEC_MARTINI_VC: + /* + * We assume the type was supposed to be one of the MPLS + * Pseudowire Types. + */ + TLV_TCHECK(7); + vc_info_len = GET_U_1(tptr + 2); + + /* + * 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. + */ + if (vc_info_len == 0) { + ND_PRINT(": %s, %scontrol word, group-ID %u, VC-info-length: %u", + tok2str(mpls_pw_types_values, "Unknown", GET_BE_U_2(tptr)&0x7fff), + GET_BE_U_2(tptr)&0x8000 ? "" : "no ", + GET_BE_U_4(tptr + 3), + vc_info_len); + break; + } + + /* Make sure we have the VC ID as well */ + TLV_TCHECK(11); + ND_PRINT(": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u", + tok2str(mpls_pw_types_values, "Unknown", GET_BE_U_2(tptr)&0x7fff), + GET_BE_U_2(tptr)&0x8000 ? "" : "no ", + GET_BE_U_4(tptr + 3), + GET_BE_U_4(tptr + 7), + vc_info_len); + if (vc_info_len < 4) { + /* minimum 4, for the VC ID */ + ND_PRINT(" (invalid, < 4"); + return(tlv_len+4); /* Type & Length fields not included */ + } + vc_info_len -= 4; /* subtract out the VC ID, giving the length of the interface parameters */ + + /* Skip past the fixed information and the VC ID */ + tptr+=11; + tlv_tlen-=11; + TLV_TCHECK(vc_info_len); + + while (vc_info_len > 2) { + vc_info_tlv_type = GET_U_1(tptr); + vc_info_tlv_len = GET_U_1(tptr + 1); + if (vc_info_tlv_len < 2) + break; + if (vc_info_len < vc_info_tlv_len) + break; + + ND_PRINT("\n\t\tInterface Parameter: %s (0x%02x), len %u", + tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type), + vc_info_tlv_type, + vc_info_tlv_len); + + switch(vc_info_tlv_type) { + case LDP_FEC_MARTINI_IFPARM_MTU: + ND_PRINT(": %u", GET_BE_U_2(tptr + 2)); + break; + + case LDP_FEC_MARTINI_IFPARM_DESC: + ND_PRINT(": "); + for (idx = 2; idx < vc_info_tlv_len; idx++) + fn_print_char(ndo, GET_U_1(tptr + idx)); + break; + + case LDP_FEC_MARTINI_IFPARM_VCCV: + ND_PRINT("\n\t\t Control Channels (0x%02x) = [%s]", + GET_U_1((tptr + 2)), + bittok2str(ldp_fec_martini_ifparm_vccv_cc_values, "none", GET_U_1((tptr + 2)))); + ND_PRINT("\n\t\t CV Types (0x%02x) = [%s]", + GET_U_1((tptr + 3)), + bittok2str(ldp_fec_martini_ifparm_vccv_cv_values, "none", GET_U_1((tptr + 3)))); + break; + + default: + print_unknown_data(ndo, tptr+2, "\n\t\t ", vc_info_tlv_len-2); + break; + } + + vc_info_len -= vc_info_tlv_len; + tptr += vc_info_tlv_len; + } + break; + } + + break; + + case LDP_TLV_GENERIC_LABEL: + TLV_TCHECK(4); + ND_PRINT("\n\t Label: %u", GET_BE_U_4(tptr) & 0xfffff); + break; + + case LDP_TLV_STATUS: + TLV_TCHECK(8); + ui = GET_BE_U_4(tptr); + tptr+=4; + ND_PRINT("\n\t Status: 0x%02x, Flags: [%s and %s forward]", + ui&0x3fffffff, + ui&0x80000000 ? "Fatal error" : "Advisory Notification", + ui&0x40000000 ? "do" : "don't"); + ui = GET_BE_U_4(tptr); + tptr+=4; + if (ui) + ND_PRINT(", causing Message ID: 0x%08x", ui); + break; + + case LDP_TLV_FT_SESSION: + TLV_TCHECK(12); + ft_flags = GET_BE_U_2(tptr); + ND_PRINT("\n\t Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]", + ft_flags&0x8000 ? "" : "No ", + ft_flags&0x8 ? "" : "Don't ", + ft_flags&0x4 ? "" : "No ", + ft_flags&0x2 ? "Sequence Numbered Label" : "All Labels", + ft_flags&0x1 ? "" : "Don't "); + /* 16 bits (FT Flags) + 16 bits (Reserved) */ + tptr+=4; + ui = GET_BE_U_4(tptr); + if (ui) + ND_PRINT(", Reconnect Timeout: %ums", ui); + tptr+=4; + ui = GET_BE_U_4(tptr); + if (ui) + ND_PRINT(", Recovery Time: %ums", ui); + break; + + case LDP_TLV_MTU: + TLV_TCHECK(2); + ND_PRINT("\n\t MTU: %u", GET_BE_U_2(tptr)); + break; + + + /* + * FIXME those are the defined TLVs that lack a decoder + * you are welcome to contribute code ;-) + */ + + case LDP_TLV_HOP_COUNT: + case LDP_TLV_PATH_VECTOR: + case LDP_TLV_ATM_LABEL: + case LDP_TLV_FR_LABEL: + case LDP_TLV_EXTD_STATUS: + case LDP_TLV_RETURNED_PDU: + case LDP_TLV_RETURNED_MSG: + case LDP_TLV_ATM_SESSION_PARM: + case LDP_TLV_FR_SESSION_PARM: + case LDP_TLV_LABEL_REQUEST_MSG_ID: + + default: + if (ndo->ndo_vflag <= 1) + print_unknown_data(ndo, tptr, "\n\t ", tlv_tlen); + break; + } + return(tlv_len+4); /* Type & Length fields not included */ + +trunc: + nd_trunc_longjmp(ndo); + +invalid: + return(tlv_len+4); /* Type & Length fields not included */ +} void -ldp_print(register const u_char *pptr, register u_int len) { +ldp_print(netdissect_options *ndo, + const u_char *pptr, u_int len) +{ + u_int processed; + + ndo->ndo_protocol = "ldp"; + while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) { + processed = ldp_pdu_print(ndo, pptr); + if (processed == 0) + return; + if (len < processed) { + ND_PRINT(" [remaining length %u < %u]", len, processed); + nd_print_invalid(ndo); + break; + } + len -= processed; + pptr += processed; + } +} +static u_int +ldp_pdu_print(netdissect_options *ndo, + const u_char *pptr) +{ const struct ldp_common_header *ldp_com_header; - const struct ldp_tlv_header *ldp_tlv_header; - const u_char *tptr,*tlv_tptr; - u_short tlen,tlv_len,tlv_type,tlv_tlen; - int hexdump; + const struct ldp_msg_header *ldp_msg_header; + const u_char *tptr,*msg_tptr; + u_short tlen; + u_short pdu_len,msg_len,msg_type; + u_int msg_tlen; + int hexdump,processed; - tptr=pptr; ldp_com_header = (const struct ldp_common_header *)pptr; - TCHECK(*ldp_com_header); + ND_TCHECK_SIZE(ldp_com_header); /* * Sanity checking of the header. */ - if (EXTRACT_16BITS(&ldp_com_header->version) != LDP_VERSION) { - printf("LDP version %u packet not supported", - EXTRACT_16BITS(&ldp_com_header->version)); - return; + if (GET_BE_U_2(ldp_com_header->version) != LDP_VERSION) { + ND_PRINT("%sLDP version %u packet not supported", + (ndo->ndo_vflag < 1) ? "" : "\n\t", + GET_BE_U_2(ldp_com_header->version)); + return 0; + } + + pdu_len = GET_BE_U_2(ldp_com_header->pdu_length); + if (pdu_len < sizeof(struct ldp_common_header)-4) { + /* length too short */ + ND_PRINT("%sLDP, pdu-length: %u (too short, < %zu)", + (ndo->ndo_vflag < 1) ? "" : "\n\t", + pdu_len, + sizeof(struct ldp_common_header)-4); + return 0; } /* print the LSR-ID, label-space & length */ - printf("%sLDP, Label-Space-ID: %s:%u, length: %u", - (vflag < 1) ? "" : "\n\t", - ipaddr_string(&ldp_com_header->lsr_id), - EXTRACT_16BITS(&ldp_com_header->label_space), - len); + ND_PRINT("%sLDP, Label-Space-ID: %s:%u, pdu-length: %u", + (ndo->ndo_vflag < 1) ? "" : "\n\t", + GET_IPADDR_STRING(ldp_com_header->lsr_id), + GET_BE_U_2(ldp_com_header->label_space), + pdu_len); - /* bail out if non-verbose */ - if (vflag < 1) - return; + /* bail out if non-verbose */ + if (ndo->ndo_vflag < 1) + return 0; /* ok they seem to want to know everything - lets fully decode it */ - tlen=EXTRACT_16BITS(ldp_com_header->pdu_length); - - tptr+=sizeof(const struct ldp_common_header); - tlen-=sizeof(const struct ldp_common_header); + tptr = pptr + sizeof(struct ldp_common_header); + tlen = pdu_len - (sizeof(struct ldp_common_header)-4); /* Type & Length fields not included */ while(tlen>0) { - /* did we capture enough for fully decoding the tlv header ? */ - if (!TTEST2(*tptr, sizeof(struct ldp_tlv_header))) - goto trunc; + /* did we capture enough for fully decoding the msg header ? */ + ND_TCHECK_LEN(tptr, sizeof(struct ldp_msg_header)); + + ldp_msg_header = (const struct ldp_msg_header *)tptr; + msg_len=GET_BE_U_2(ldp_msg_header->length); + msg_type=LDP_MASK_MSG_TYPE(GET_BE_U_2(ldp_msg_header->type)); - ldp_tlv_header = (const struct ldp_tlv_header *)tptr; - tlv_len=EXTRACT_16BITS(ldp_tlv_header->length); - tlv_type=LDP_MASK_TLV_TYPE(EXTRACT_16BITS(ldp_tlv_header->type)); + if (msg_len < sizeof(struct ldp_msg_header)-4) { + /* length too short */ + /* FIXME vendor private / experimental check */ + ND_PRINT("\n\t %s Message (0x%04x), length: %u (too short, < %zu)", + tok2str(ldp_msg_values, + "Unknown", + msg_type), + msg_type, + msg_len, + sizeof(struct ldp_msg_header)-4); + return 0; + } - printf("\n\t %s TLV (0x%04x), length: %u, Flags: [%s and %s forward if unknown]", - tok2str(ldp_tlv_values, + /* FIXME vendor private / experimental check */ + ND_PRINT("\n\t %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]", + tok2str(ldp_msg_values, "Unknown", - tlv_type), - tlv_type, - tlv_len, - LDP_MASK_TLV_U_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "continue processing" : "ignore all, notify", - LDP_MASK_TLV_F_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "do" : "don't"); - - tlv_tptr=tptr+sizeof(struct ldp_tlv_header); - tlv_tlen=tlv_len-sizeof(struct ldp_tlv_header); - - /* did we capture enough for fully decoding the object ? */ - if (!TTEST2(*tptr, tlv_len)) - goto trunc; + msg_type), + msg_type, + msg_len, + GET_BE_U_4(ldp_msg_header->id), + LDP_MASK_U_BIT(GET_BE_U_2(ldp_msg_header->type)) ? "continue processing" : "ignore"); + + msg_tptr=tptr+sizeof(struct ldp_msg_header); + msg_tlen=msg_len-(sizeof(struct ldp_msg_header)-4); /* Type & Length fields not included */ + + /* did we capture enough for fully decoding the message ? */ + ND_TCHECK_LEN(tptr, msg_len); hexdump=FALSE; - switch(tlv_type) { - + switch(msg_type) { + + case LDP_MSG_NOTIF: + case LDP_MSG_HELLO: + case LDP_MSG_INIT: + 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(ndo, msg_tptr, msg_tlen); + if (processed == 0) + break; + msg_tlen-=processed; + msg_tptr+=processed; + } + break; + /* - * FIXME those are the defined objects that lack a decoder + * FIXME those are the defined messages that lack a decoder * you are welcome to contribute code ;-) */ - case LDP_TLV_FEC: - case LDP_TLV_ADDRESS_LIST: - case LDP_TLV_HOP_COUNT: - case LDP_TLV_PATH_VECTOR: - case LDP_TLV_GENERIC_LABEL: - case LDP_TLV_ATM_LABEL: - case LDP_TLV_FR_LABEL: - case LDP_TLV_STATUS: + case LDP_MSG_LABEL_REQUEST: + case LDP_MSG_LABEL_RELEASE: + case LDP_MSG_LABEL_ABORT_REQUEST: + default: - if (vflag <= 1) - print_unknown_data(tlv_tptr,"\n\t ",tlv_tlen); + if (ndo->ndo_vflag <= 1) + print_unknown_data(ndo, msg_tptr, "\n\t ", msg_tlen); break; } /* do we want to see an additionally hexdump ? */ - if (vflag > 1 || hexdump==TRUE) - print_unknown_data(tptr+sizeof(sizeof(struct ldp_tlv_header)),"\n\t ", - tlv_len-sizeof(struct ldp_tlv_header)); + if (ndo->ndo_vflag > 1 || hexdump==TRUE) + print_unknown_data(ndo, tptr+sizeof(struct ldp_msg_header), "\n\t ", + msg_len); - tptr+=tlv_len; - tlen-=tlv_len; + tptr += msg_len+4; + tlen -= msg_len+4; } - return; + return pdu_len+4; trunc: - printf("\n\t\t packet exceeded snapshot"); + nd_trunc_longjmp(ndo); } -